https://www.warzone.com/MultiPlayer?GameID=40827301

"they" were blacklisted and reported

Could be friends. It's pretty hard to play 1 RT game with 2 accounts. I don't believe the admins care about general fair play. I remember one dude winning his games by giving everyone thousands of cards and the booting them.

OP has made multiple threads about same thing but different players. It's impossible to change their mind that it isn't necessarily the same person.

Either way, I wouldn't say you should make threads like this until admins have decided what the outcome is. You shouldn't potentially falsely accuse someone of this publicly.

Teaming up in FFAs isn't against the rules and game description doesn't explicitly say not to, though private messaging is disallowed. You could easily bypass that using mail or messaging platforms (if players already know each other) or real life interactions.