Many publishers are even trying to get people to use their own(ed) shops instead of a store; Bethesda, for example, holds Fallout 76 exclusive to their Bethesda.net service, a tactic that likely also will mean that upcoming games like Rage 2 stay exclusive to it.
Activision-Blizzard has done the same with their games on battle.net, and others also at least require you to open an account with their own system to play their games (Rockstar Social Club, UPlay, etc.) in addition to being on Steam.

That all said: This approach can only work if we as customers allow it to work; If too few people buy from Bethesda.net, they will be forced to abandon the idea sooner or later, and put their games up with a secondary store again. The EGS is trying to get devs to sign on with them by granting the a bigger cut, but for customers, they do not seem to offer anything that would make them want to use the store because of its inherent qualities (which is why they have to resort to getting exclusivity deals - if you can't compete, use force).

The current batch of AAA titles mostly are nothing to write home about anyway. I find myself spending an increasing amount of time with indie titles, because they're simply more engaging in a "I'm having a blast" kind of way; I don't feel I'm missing out because I refuse to buy titles like Shadow of Tomb Raider or Anthem.

That all said: There are some big, old-ish titles I would love to buy on GOG (mostly because they have DRM attached that prevent me from buying), but sacrificing indies for them?
I'm not a fan of pixel visuals, but from what I see, indie and small-ish studios are solid from a revenue perspective: They likely won't make you billions, but there are steady customers that have confidence in your products. The current AAA market (particular on PC) seems pretty volatile, if you take a look at all the shitshows that happened in the last 1,2 years. Adding the exorbitant cost of failure and a pretty thoroughly eroded consumer trust in its publishers, I think it's liable to implode in the next few years unless those publishers really step up their game.

So, sure, if possible, I would like to see some semi-recent AAA titles (Prey, RE7, Sniper Elite 3/4) added to GOG's catalogue, but I would not want them to compromise their indie/AA catalogue for it. In fact, if you gave me the choice of getting a good indie game (They Are Billions) added, or a new AAA release (let's take the RE2 remaster), I would vote for They Are Billions.

Well, never say never. Years ago it was commonplace to say that LucasArts would never be here. Yet one day, Gog started releasing their games.
After that it was Bethesda that would never come here. Now their games are here, tho we're missing Skyrim as a major entry from the wishlist. I don't think Gog would hold out on us for so long, a few weeks maybe but not years. So I believe Bethesda must have held it to release later. They probably want to milk the DRM crowd a bit longer.

There's no point in "demanding" AAA releases, short of voting on the wishlist. If Gog doesn't show signs of releasing a highly coveted game it is not because they don't want your money but because they obviously can't. Most of the time either the publisher won't sign a deal for their own reasons or legal messes (made by the publisher back then) means a deal for a particular game could involve more than one company, sometimes defunct companies, sometimes the rights to assets belong to an unknown 3rd party... and unless Gog gets all their signatures together that game will never see the light of day here.

well i want old triple A titles i dnt want new ones filled with micro transactions like some posters here have said, its one reason i am here on GOG, no microtransactions in game and DRM free thats how gaming was when i was a kid and i wanna keep it that way, the only launcher i have is battle net cos i play warcraft,diablo and overwatch, wont own any other launcher

This.

All these games are Tech Demos?

Armies of Exigo
Bohemia Library of games
Blade of Darkness
Diablo 1
Diablo 2 + Lords of Destruction
Starcraft 1 + Brood War
Warcraft Orcs vs Humans
Warcraft II Tides of Darkness + Beyond the Dark Portal
Warcraft III Reign of Chaos + Frozen Throne
Black and White 1 and 2
Command and Conquer series (Prioritize the games made from Westwood themselves)
Age of Empires + The Rise of Rome
Age of Empires 2 The Age of Kings + Conquerors
Age of Empires 3 + Expansions
Civilization 1
Civlization 2 + Conflicts + Fantastic Worlds
Half-Life 1 + Opposing Force + Blue Shift
Half Life 2 + Episodes 1 and 2
Counter Strike 1.6 and Condition Zero + Deleted Scenes
Dungeon Siege 1 and 2
Mechwarrior 1
Mechwarrior 2 + Mercenaries
Mechwarrior 3 + Pirate's Moon
SimCity 1
The Sims 1 and 2 and thier expansions
Battlefield 1942 + The Road to Rome + Secret Weapons of WW2
Batllefield Vietnam
Battlefield 2 + Special Forces + Euro Force + Armored Fury
Battlefield 2142 + Northern Strike
Call of Duty 1+United Offensive
Commander Keen
Heretic Shadow of the Serpent Riders
Hexen: Beyond Heretic + Deathkings of the Dark Citadel
Hexen II + Portal of Praevus
Heretic II
Total War Shogun 1 + Mongol Invasion
Total War Medieval 1 + Viking Invasion
Total War Rome 1 + Barbarian Invasion + Alexander
Total War Medieval 2 + Kingdoms
Marathon Trilogy
Myth seires
Wizardry 1 to 5 + their expansions if any.
Tom Clancy's Rainbow Six Rogue Spear + Take Down - Missions in Korea
Tom Clancy's Rainbow Six 3 Raven Shield + Athena Sword
Tom Clacny's Splineter Cell Pandora Tomorrow
Tom Clancy's Splinter Cell Chaos Theory
Grand Theft Auto 1 and 2 + expansions
Grand Theft Auto 3 + Vice City + San Andreas
Red Orchestra 1
Rise of Nations Gold
Shadowcaster
Dune 1 and 2
Dark Messiah of Might and Magic
Zax: The Alien Hunter
Gorasul: The Legacy of the Dragon
Pool of Radiance: Ruins of Myth Drannor
Siege of Avalon
Seal Of Evil
Warhammer 40,000 Dawn of War 1 + Winter Warfare + Dark Crusade + Soulstorm
Warhammer Fantasy: Dark Omen
Warhammer Mark of Chaos + Battlemarches
Power Monger
No One Lives Forever 1 and 2
Duke Nukem 1 and 2
Duke Nukem 3D + all expansions.
A PC version of Turok 3 done by Night Dive Studios
Witchaven 1 and 2
PowerSlave (Exhumed)

Not really -- but then again, not all of them are AAA games. The assets for Duke Nukem 1 could easily be designed by any single indie developer. And was Duke Nukem all that popular before the 3D version?

I think AAA sorta means "big budget" and also "really successful". But the term is really fluffy, which makes this debate kinda pointless.

GOG needs Dungeon Master, Birthright: Gorgon's alliance, Buck Rogers games and Descent into Undermountain.