The BTC fees are quite high, so if we only gamble with a few bucks, then using BTC seems wrong. But if we win big and can cash out a few thousand USD then I would still go for BTC. The bigger problem I have when gambling long term, is that the return on BTC is so high these days, that making similar returns with gambling seems impossible. It might be just better to hold the coins and keep gambling with FIAT money. When using USD or EUR as base currency than converting too often just doesn't makes sense. Doge might be a good alternative, but the price is also rising recently.
Correct me if I'm wrong but don't crypto casinos have a local wallet that stores our funds when we gamble? Cause otherwise, it'd honestly be pretty stupid if we were charged fees for every gamble we do. Ofc, putting it in your wallet of small bucks in intervals can also be what you meant, but that could honestly easily be fixed by putting a monthly limit which you reload every month, + checking the network for when these fees are at three lowest. There are also alternatives like Doge as you said, and honestly, some people would still rather use crypto rather than fiat due to how easy it is to load your account at timees, compared to fiat (and ofc, its decentralization as well).