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I'll tell you some disadvantages that I noticed when I started using betting sites:
I deposit in bitcoin, for example the bitcoin price is $9000 and I deposit on the betting site 0.01 BTC and win some bet and I stay 0.012 BTC, but the bitcoin price drops a lot to $6000. even if I have transformed 0.01 btc to 0.012 BTC I will be with little profit and sometimes I will have losses, it's an annoying thing that we have to deal with
That is only a disadvantage if you are looking to get more USD and not BTC. If you're looking to double your
USD and are afraid to have BTC's value potentially dropping, you'd have to play with fiat instead (or stablecoins).
My usual goal was to double my crypto, not my fiat value. After all, what we are holding in our wallets is Bitcoin.
You could double your fiat value from $100 to $200 with crypto gambling and then have fiat hyperinflation leading to the devaluation of your winnings. Same thing, but takes longer to notice.