no it's dependent on your history. same with every sportsbook. nobody will let you sign up and begin doing huge bets unless you're referred by different companies or hosts. turning over 40m doesnt really mean much as far as being a big player its not a large turn over at all. stake wouldn't limit a large player for winning 50k. so i guess there's more to it than being explained. probably loaned his account to someone and it got flagged etc.