I signed up at 7bitcasino using the TOPBONUS promo which was "120% and 100 free spins"
The terms for the promo were
Unlimited cash out from bonus
3 mbtc max cash out from free spins
I deposited 1.4 mbtc and the casino match was 1.6 mbtc, total starting balance was 3 mbtc. I proceeded to win $12 in free spin winnings.
After several hours, my account was at 19 mbtc, and hit the rollover requirements for the promotion and had my account reduced to 3 mbtc, per the promo policy.
I continued to play for about 12 hours over a couple days, and for the account balance back up to 40 mbtc. I didn't use any other promotions, just built up from that 3 mbtc.
I went to withdraw my winnings and the casino declined the request and took an additional 33.8 mbtc, citing the standard casino rules of max cash out from free spins being 5 mbtc.
Despite the fact that my promotional terms had a max free spin cash out of 3 mbtc, and despite the casino already enforcing the free spin max cash out, they came back a second time to take an additional 33.8 mbtc for the exact same free spins, this time using the standard casino rules for free spin max cash out.
Essentially, two different sets of terms were used and enforced on one set of free spins and it stemmed from the one event of $12 in free spin winnings. Additionally, as I mentioned, my account before the free spins was 3 mbtc and the account ended the promotion at 3 mbtc. So, the free spins didn't even have a single cent id impact on the account.
They refuse to repay the second amount taken od 33.8 mbtc. In fact, they pretend to not understand English, and cite general casino terms.