What do you mean by "effective" mate? I've gamble for years using crypto, and here's my thought:
Pros:
- Better privacy.
- Relatively cheap fees, depend on what coin you use. But the fees are still there, fee from market, gas/miner fees, casino withdrawal fees.
Cons:
- It can't be 100% free (0 fees).
For some casino, let's say BK8, fiat withdrawal is free. And bank transfer is free as well, so you can have 0 fee.