With not much details mentioned by OP the payout to be assumed here is 2.00 since that's the default settings on most or nearly all bitcoin casinos when you start betting.
Like the others have said predicting long streaks wouldn't help and I agree with them because even if you do know the percentages it could work against you because there can be certain days where these streaks happen more frequent than usual.
Does anyone have any idea how often let's say 15-20 red streak come and go? Would like people who have somewhat of an idea, thanks!
Having 15-20 red in a row is not something extraordinary but first, be specific if this is all about dice or roulette.
It's most likely to be crash since the title mentioned bustabit.