He has both nationalities
His flag is randomised apparently
Mateusz Wilczewski doesn't sound like a very british name...
He's British-Polish, but chooses to hold British nationality in CS I believe, BTS has been super weird with flags over the competition, I remember one game when they said a player from some Brazilian team, f4stzin maybe, was American, so production is a little weird.
Born in polan,british citizen
Flag is 50/50 every match
he is indonesian dude, BnTeT is polish, learn the fucking flags
He spent whole life in UK and sounds UK. He is UK, lets be honest. He also has UK as flag on faceit. Polish just want to claim a player to their dying scene.