The initiative is not asking for retroactive enforcement.
They are asking for an end of life plan for games made after some TBD date. Something that at least gives end-users a chance that it can be played after a corporation ends support. Ideally that would be server binaries, but it could also mean documentation on how the server infrastructure works so it can be rebuilt by motivated end-users.
PS's use of League of Legends is awful because all they would need for an end of life plan (if it had been required at the time) is to add a LAN mode just like PvP games from years and years ago, I.e. Quake, Warcraft, Starcraft, Counter-Strike, Halo... Etc etc etc.
That's it. That doesn't require "endless" support.
In the USA it's performative, but in the EU it means they will actually need to talk about it.