I am retarded, so if you watched his 1h video where he dissects Mald's twisted views on the initiative you'll probably understand it better than what you'd get by listening to me, but the gist of it is that devs will have to engineer games in a way that it will be possible for anyone who bought a game to run their server, even if for console that means renting their own instead of hosting it locally, if I'm not mistaken. As long as devs give you the necessary software bits, even if stripped down to the bare minimum because of, for example, some services that the devs/publisher don't own and have bought a license for, as long as the game is in a playable state (vague wording is intentional), we're good. I'm no expert but I'm thinking something like skill-based matchmaking. If it's from a third party, and not from the devs/publisher, they simply won't package it with the EoL bits, the game is still in a playable state though, so they're good.
As I said, watching the video will explain things better, as my understanding is probably partial or wrong somewhere, especially technicalities, but I hope it's enough to give an idea!