I can understand the complaints about the old DRM "purchase" scenarios, where they presented the transaction as "you're buying a copy" but what they delivered was a technologically hobbled rental that may or may not remain usable - and would likely fail in ways the consumer didn't understand. There was a lie there that needed to be exposed - companies were cheating people out of money by giving them false expectations.
And I am saddened that Public Domain has been cheated so many times. Again, there's a clear complaint here that Disney and other media companies have benefitted from public domain, but are unwilling to "give back". That feels like cheating, and it would be nice if more people pushed against that. Again, I get this case.
But in the case of Disney+/Netflix type services, they're up-front that you're paying for the ability to watch the content for a certain period - and generally they seem to be delivering on that. If you don't like the technology they're using, or you'd like commercial media to work on some other system... then complain or hope or whatever. But it's not like you're going to wake up one day and realize your investment in Disney+ has been stolen from you. It's hard to feel like they're doing something terrible or ethically wrong here.
It's hard to even think out a "slippery slope" sort of scenario here; there's reasonable competition, and there hasn't been big/successful efforts for those competitors to lock each other out of platforms or whatever. And while Netflix isn't, like... a saint or something, the rise of streaming services has led to people seeing a broader range of content - both in terms of stuff from smaller producers, and from different places in the world. How many Americans would have seen Squid Game or Money Heist in 2005? It's not exactly an indie paradise (like Steam is for video games), but it's better than older models.
If I could change something about streaming (especially Spotify), my push would be to move to "user-centric" payment models, to increase the amount of "money I pay" that goes to "artists I spend time with".