JogsterXL: Yes, they should, especially the Half-Life and Portal games. I already own the Valve games on Steam, and some of them are even DRM-Free once downloaded and zipped up. Releasing them on GOG would provide another avenue of revenue and exposure (not that these games need it) and I’d double-dip and buy them again if they ever released here to have GOG copy.
I didnt have to zip anything myself, all the HL and Portal games are playable for me without the steam client.
Heck 90% of my steam games work fine without their client, so when ppl on steam its not posible to play their steam games without the client thats just not true for the most part and is a myth by now.
Yes online games are not the same and require the Goldberg simulator, and yes ofc there is a few games here and there that has steam drm in it, such as steams version of Deux Ex.
I deleted my ~20 old account and in the process had to manually dl and transfer all my ~600 games to be able to keep and play them.
I didnt check go through all if they work yet, but so far 90% of the ones I did (at least 200 ive gone through by now) works fine.
So I was surprised the Portal and HL game works without the client tbh since its Valves own games, but they do :)
(might be a few HL mod games and such that dont, I never played all of those yet, but offical ones do)