I'm glad this has been done more recently, and even been expanded to other genres, like the upcoming Knockout City which will apparently feature some sort of rollback netcode[1]. I've been playing Lethal League Blaze, and playing against people with 80 to 150 ping is possible, and doesn't feel horrible which is wild, since in other genres that have to rely on dedicated servers to be somewhat decent like CS:GO or Valorant, anything above 50 or 60 ping (to the server, not the other players) is pretty jarring to experience.

[1]https://www.nintendoenthusiast.com/knockout-city-is-the-wild... (only mentioned in one sentence)