For this reason alone, Betfair has no reason to ban or close your account when you should win. This is what Betfair first became famous for; peer-to-peer betting. Whilst the Exchange account won't be closed for winning, there is an additional commission rate.
On Betfair Sportsbook, you can bet on any of the 7 Esports competitions available. Some of the most popular competitions include FIFA Electronic Football, FIFA e-Sports - GT Leagues, LOL - Demacia Cup, WR - WRL Asia, CS2 - European Pro League Division 2, Dota 2 - BB Dacha Tournament, CS2 - Hator Games.