I want to remind again that Casinobit admin is misleading about 100% payout! Having 2 zeroes on the roulette gives him 5.26% advantage.
That depends on the payouts. For example if he pays 37-1 for a single number instead of the usual 35-1 then it could be zero edge. Seems unlikely though. It would be simpler to just not have zeros on the wheel. Makes the maths easier.