I have massively better quality, stability, and latency with the RemotePlay app over the internet from PS5 than I do with Steam in home streaming actually in my house. It’s still not good enough for high precision games, but Steam isn’t close.
PS4 can’t stream for shit because it can’t do the encoding.
What do you think emulation is?
Copying your own copy of a game and using tools for compatibility is what we’re talking about, is protected, and already has the case law demonstrating so.