Are you actually downloading all the stuff from GoG locally? I hear this argument often and it is a good one in principle. Until you try to backup a large library. Before I got my Steamdeck I bought a lot from GoG as well and set up a script to backup to my NAS a few times a year. My GoG library is considerably smaller than my Steam library (~60 games vs. ~1.000 games) and it is still taking up multiple TBs on my NAS, even though I’m only backing up windows .exes. If GoG would go under suddenly, I don’t think a lot of people will have their library backed up, nor can back up their library fast and sufficiently enough to make a difference. The true utility of Steam and other online platforms may be their storage capacity.