SugarCasino sent me an message where they accuse that I have breached their Bonus Terms & Conditions, and thus they have shut down my account and decline to pay my winnings of 3,329 €.
I made a deposit of 200€ that gave me a bonus of 200€ and played it to my favorite slot, which happens to be Secrets of Atlantis, with the maximum allowed bet (4€). In my opinion there is nothing unusual or wrong with that, in fact my previous smaller withdrawal was accepted even though I played it in the exact same manner. I do not understand how someone could call this cheating, bad faith or 'taking unfair advantage of bonuses' as defined in their Bonus Terms that they referred to me. I was just willing to take more risk in hopes of a higher return and luckily it worked out this time.
I expect that SugarCasino makes things right by paying my winnings as soon as possible.