Aside from Fairlay there's also this
list of sportsbook and exchanges including reviews from other sports bettors.
As of now there's really no good crypto betting exchange that could compete against betfair but still there's a few good ones that's available.
Is it worth it to ban an account from an allowed country?
That's up to you, if i'm in that situation I wouldn't take the risk unless I couldn't find the market I prefer betting on.