Or maybe you just have a pack rat obsession with owning things while the rest of us as just looking to get some entertainment. I "buy" a non-transferrable license to a DRM-locked online-tied sandbox, even a DVD which also has DRM is more liberal as I can sell, lend, play anywhere without anyone's approval or activation but even that one I can't back up or format shift legally as I expect to do with my own property. None of that is an absolute necessity though, what matters if if the value (utility, desire) exceeds the costs (money, inconvenience) and if I am confident that I'll get my money's worth from it before Steam goes under and the service disappears in a puff of smoke I come out ahead. If I desperately want to play it 10+ years down the line I suspect it will be available somehow on GOG (legally), TPB (not so legally) or whatever so it's not a "now or never" situation.
Yes, I get pretty pissed when you abuse DRM to deliver use control like unskippable commercials and region locks, crap that acts more like malware (hello StarForce) and such things but ultimately I am looking to get entertained, it's in the same class as Netflix (subscription), Spotify (subscription) not about having my documents and data trapped in proprietary products with lock-in. Realistically if Steam said all games are now a 5 year lease it'd probably not change my habits at all. If they start acting like asses I always have the option to say here are the letters F and U, I'll be sourcing my entertainment elsewhere from now on. It's not like there's a shortage or anything, particularly since it won't cost me a moral fiber to download games I used to have on Steam off TPB should that ever become necessary.