I was talking about countries that fit both a) and b)
You want countries like UK, Germany, Austria and other high GDP western european countries included in the playerpool, but not the countries, which are responsible for the overwhelming majority of botting, collusion and payment fraud.
I don´t have reliable data on this, but I´d estimate that simply by banning the Baltic States, Russia and Belarus you would get rid of at least +2/3 of botting and probably +90 % of payment fraud.