What kind of community servers do you think will show up once they become a thing?

Here's what I know would show up.

Surf/Parkour. With how movement works in this game, I'm sure people would make some absolutely crazy maps for this game.

Duals. There is not a universe where dual servers aren't a thing. Not only would this be fun, but a great way to warm up.

Custom maps and gamemodes. Maybe some servers bring back 4 lanes but make it an 8v8. Maybe someone just recreates TF2 with functional payload scripts.

24/7 Instant Respawn. The follow up to the one above. Definitely needs some changes to make sure it doesn't become a stomp the entire time, but I know people love their instant gratification game modes.

I'm wondering if you have any other ideas of what might show up when community servers become a thing?