Yes.
There are just indirect proofs.
For example, if BTC is rising, your shurely loose.

Or if you have very high persent of your balance won by gambling.

Or you just withdraw half of the balance or some balance.

May be it can be expand on winning, deposites and etc. of your referrals.
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To stubid c..nts: This discuss have still no linkage to 'PROVABLY FAIR" system. Cause smth may be fair only proofably.