Just don't connect people from other regions unless they are in party.
EU player will play in EU
Asia player will play in Asia
And Na in Na.
PBM for cross platform
CC can try harder for Connect to a game server through platform. Like only game will queue for Windows VS Macos VS Linux VS ChromeOS **or **Mobile VS IOS **or **Xbox vs PS 4 vs Switch.
If there are less than 300 people in 1 game, then PBM will be disabled.