I find it weird that you're making what seems to me to be a strawman argument about "burdening (mostly) small developers," as I'd say they are mostly not the ones trying to do this bullshit where they try to retroactively destroy art and culture because it stops being profitable enough. Indie studios typically don't design their games to use publisher-operated servers with ongoing costs attached in the first place, let alone to self-destruct when they shut off!
Releasing source code isn't without extra work. My point is, unless you make sure to specifically target the companies abusing gamers, you're going to mainly hurt the part of the industry that is not the problem.