I've never really been a big fan of gambling with crypto, the only reason to hold crypto should really be either to speculate or to use it as a functional currency. The extra layers of costs in Blockchain fees just add an unnecessary layer of complexity when there is already plenty of big name fiat gambling brands, in my country at least. I tend to find a lot more freebie offers from the bigger gambling sites that operate in fiat currency, presumably because they have a more reliable base of regulars they're trying to entice.