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In fact, Call of Duty (2003) already had it 12 years ago. It may have been around for longer than that in other games.
I think QuakeWorld (Q1 multiplayer) had this in 1996

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I don't play much anymore, but from what I've seen, there's less trolling than there was immediately after the release, but it still happens. I saw a guy troll people with nades and C4 on the final map as everyone was gathering stuff to fill up the first stash. That kind of thing is commonplace enough that no one really commented on it. The weird thing was that after a few minutes of trolling and robbing people the guy started playing normally.
Accidental trolling from noobs in vehicles still happens all the time, too, so that's still broken and it would still be useful to have an XP floor on drivers.