Hacker News Reader

Rollback was added by the community to Melee. With in-game matchmaking. It's a combination of a modded Dolphin + cheats to mod the ISO itself.

Sounds about right. Never was part of the Melee community but I was always impressed at their ingenuity to figure out multiplayer in the face of Nintendo's active community hostility and bonkers multiplayer UX

At least 2006 https://en.m.wikipedia.org/wiki/GGPO

Ah yes this is what I had in mind

No, the first major game to use it and push it was Skullgirls.

An exemplary example of how to make a great game. Unfortunately it has been though a series of unfortunate events and never gets the recognition it deserves

"Series of unfortunate events" is an understatement, but I would say it gets due recognition--it's an indie game over a decade old and still earns its slot at major fighting game tournaments and (after said events' hopeful end) still has support from developers and community alike.