Aleksandr.Mgn: I would have bought INSIDE too, but the developers blocked the ability to buy the game on both Steam and GOG.
eric5h5: They did not; developers have no ability to block purchases on any store. They can remove their games from sale entirely but that's a different thing. Stores themselves can block regional purchases for various reasons, but they can't block a purchase that you made on another store since they have no way of knowing you did that.
The INSIDE developers themselves are publishers of their games. At their request, stores have restricted access to their games for Russian users. After the events of 2022, many publishers have also blocked their games for Russians. On the GOG platform, the pages of blocked games are completely inaccessible, and on Steam, the message "Oops, sorry!" appears.