I really played a lot of FF on community servers so I haven’t seen it myself, but assuming there are still vote kicks for automatic team killing like it was in ranked, here’s an idea:
I’ve heard this tossed around before, but why not change the vote to kick this player into vote not to kick this player? It’s pretty common to have teammates on pubs who just don’t even look at votes, so something like this would help get around the players who just don’t vote at all. 3 or so team kills in quick succession, or 3 or 4 kills on the same teammate would be a good time to call that vote.
Although as @ThePigVomit said, killing a low HP teammate and reviving them is a great strategy, so it might be better to only count /p rather than just teamkills.