I also prefer to use USD in my bets, in some cases I use Litecoin, but I don't use bitcoin, even when the rates are low, I still don't use bitcoin in my bets. I prefer to keep a certain difference between the funds allocated for my bets and the funds allocated for trading and hodl. Also because I don't see gambling as something that would give me profit in the long term, playing with bitcoin, I would be running the risk of losing bitcoin
In my opinion, I think that gambling with any cryptocurrency that allows you to stay within a budget is okay. Sometimes if you choose to accept or gamble with Bitcoin, particularly based on the fluctuations in its value, it may exceed the specific amounts you wish to gamble with because the Bitcoin at that time increased in value. It may not be something serious for someone, but if you think that's a problem for you, then you should use a cryptocurrency that you know you're okay with, it still counts.