4plebs hasn't shown post stats by country in years.
Jannies don't delete their own thread and they're responsible for the majority of shitposting in blue boards.
Then go somewhere else or lurk multiple sites. 8chan.moe has /v/, /a/ and /pol/. shamiko.org/a/ and 4.0-chan.ru/xomy are anything goes liveboards with an /a/ and /pol/ focus respectively. There's tvch.moe for /tv/, dont know where to find /sp/.
No idea. I heard 4chon was back up again, they might have a /fringe/. Otherwise /xomy/ has esoteric discussions from time to time.