Digital content is not forever. If I can't purchase it and download it to my local hard drive, I'm not purchasing it.
Reminds me of those old anti piracy PSAs: "you wouldn't download a car." (note: yes, yes I would if I could).
But if the new car-buying process was "pay $20k for this Honda Civic, but just know that we are just allowing you to drive it, we can take it away from you at any time" you can be sure that either no one will ever buy cars again, or they'd just "steal" them.
If compliance is too hard or too inconvenient or just plain stupid or malicious, then people won't comply. Easy as that.
GOG for buying stuff DRM free, and Game Pass for renting it cheaply if you don't care to own it
On the other hand, many games (by number at least) on Steam do not have any DRM and you can back up the installed files as easily as you can back up a GOG installer. Many more games only need Steamworks which is easily bypassed.
Meanwhile Valve is actively working on making Linux gaming better (which I care about) while GOG/CDPR can't even be bothered to port their own games or their store client.
Generally this has only happened with games that are no longer developed, but if they got yanked for any other reason I believe Valve wouldn't distribute any new patches to me.