It's possible to get a profit despite a site being not provably fair. Even if the site made misleading claims, it only means that the odds of making a profit are less than what is advertised. It doesn't mean that the odds of making a profit are zero. It seems like you are one of the lucky ones.
I just love autobet system in 999dice
probably if other sites "maybe coinroyale.. hhe" make a similar autobet system, i'll move over there
999dice is a scam site and the game is rigged. Their feature of the instant autobet make you unable to verify your bet and there is already alot of scam accusation about the site if you read them from scam accusations boards