Pokemon players invading into monster hunter rooms

I’m in a monster hunter room server just waiting for people to join since other once are full but out of nowhere some 3 pokemon players show up and take the rest 3/4 spaces and they absolutely refused to leave. TBH, is there any way at all to make sure things like this dont happen. as if monster hunter rooms arent limited enough.

they are only marked as ‘Preferred Game’, imagine that there`s a room for game ‘X’ and nobody
is playing game ‘X’ and all other rooms are full, or physically more distant causing lag.
people would simply choose the best or the available, you can still host your own rooms.

and you could also join other rooms that are not the same as the game you want to play.