When I knew Bitcoin, I started playing gambling. So I used this currency to play comfortably compared to Fiat money. I don't care what's going on with the Bitcoin price at least it's still worth. It's easier to use Bitcoin because making a deposit doesn't require a personal identity. As we know we have to provide a full name and bank account to deposit on gambling sites using fiat money. The most important thing for me is to remain anonymous.
You only gamble using bitcoin and not for fiat, because at the beginning you have said if you start gambling after knowing bitcoin and that proves you are not gambling using fiat even though it is in real life. This is the reason why someone chooses to gamble using crypto or bitcoin because one definite thing is about profits with the aim of collecting more bitcoin apart from the main purpose of being anonymous.