timppu: Steam users don't apparently mind creating lots of extra third-party accounts and installing lots of extra clients, so I guess it is fine.
tfishell: Oh no, a portion do mind, but they'll put up with it ultimately (granted some of us on GOG get used to things too :P). I do like the idea of that potentially funneling more users to GOG.
Yeah, I was being partly sarcastic... and partly not, as apparently such "third-party client/account" games (like GTA IV and V) have a far higher acceptance rate on Steam, than they'd have on GOG.
I guess if you don't mind several layers or DRM and more and more installed clients on your PC, it doesn't matter much. A few days ago I installed both GTA IV (Steam) and GTA V (Epic) on my PC, one after another. With GTA IV, it automatically installed the Rockstar client in the back, and required me to create a RS account (going to my email to validate the creation and blaa blaa blaa, you know the drill).
Then after that when I installed GTA V from a different store (Epic), the whole RS client/account process was "invisible" to me. It did check if I have the RS client and account in place (auto-login in use for the RS account), and since it found the existing client/account which I had just installed with Steam GTA IV, it was satisfied and there were no extra steps for me involved.
So I guess most Steam users don't mind the extra accounts and clients, as long as they are not bugging them constantly. The only hurdle is the initial "please create and validate yet another gaming service account".
Of course if I much later go to re-install GTA IV or V on another PC, I may have already forgotten I have that RS account, and at that point I am like "Huh? I have an account there? I wonder which email and password I used there? The same as in Steam or Epic? I hope so.".