While Valve isn't the worst company when you buy on GoG you support a company dedicated to keeping things DRM free and preserving older games. Plus fight the Steam monopoly.
GOG and CDPR are not the good guys. They released a complete disaster of an unfinished game with CP2077, and they KNEW it was broken and still shipped this gigantic pile of trash. Their promo also included a bunch of made up hype trash that was completely just artificially created in video, and they made it seem like it was gameplay. So they LIED to hype their unfinished trash game. Much of that never made it to the game.
Also even the fixed game now is just a silly boring sandbox game, what makes it good is the story, but It's for sure overrated. I enjoyed it but still overrated.
They also censor for the CCP, the removed the game Devotion because it had a JOKE inside that was not even visible to the normal player you needed to get out of your way to see some devroom or something with it. The BLACKLISTED a game simply because they make a JOKE of the Chinese president.
All big companies are EVIL by definition. Do not act like they are the good guys because they grift of selling games without DRM, they sell them at higher prices to make big money. They grew into this immoral dirt megacorp.
If GoG starts supporting linux I'll be happy to support them.