Me, tbh I don’t like meta but the groups in facebooks is probably what keeps me there, for example there is a group about an anime and the guys there literally translate the new volumes of the novel months faster than other piracy sites, almost in the moment, there is also the memes and other posts that only appear around those groups. Not even reddit has that content, so what keeps me attached to facebook is mainly anime groups
Steam, I can install the Steam client without any problems on moat distros, also Valve has done a lot of things to make the Linux gaming better.
Gog doesn’t have a desktop app for Linux, they’re focused totally Windows so I don’t care about it.
If I want “DRM free” games, then I pay for the original version with DRM and then pirate it to play whenever I want.