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Bustabit never had such a bug. In bustabit v1 there was a pvp bonus system which rewarded you for cashing out after other players, but before the crash. At certain times it was profitable to bet at 1.01x if the players you were playing against were going for high multipliers (i.e. not cashing out often). This strategy could be trivially be defeated by other players cashing out after you (e.g. 1.02x).
However this was a very explicit part of the game, and there were never any bugs around it.

Derailing a bit the thread here, apologize in advance.
Maybe I don't remember things correctly but weren't you the business owner of moneypot game when or happener there was a player that was exploiting the game in a way you (or the business owner of it wasn't you) defined "smart"?
I remember it was related to the game latency and that player was using a script that allowed him to cash out before the very istant the game was busting ( so the last available multiplier was revealed ) taking advantage of that latencyand setting the desired multiplier in that moment.
I witnessed him playing and he was warning other players in chat not to follow him on his bets because otherwise they would have gotten hurt.
Maybe I'm confusing a bit things but remember for sure this kind of exploit happened.