I would say from experience the country that has a disproportionate number bad players by population is for me American only because i think Americans love to gamble nowt wrong with that
Lots say Russian but that is not my experience they seem pretty solid on the whole brazil has a fair share off good and bad , They have the largest player pool me thinks so makes sense they would have more bad players . Every country got them
Canada seems to have a lot of angry players online these days not sure what that is about . And i have come across lots of bad german players .