By using Electrum you can avoid taxes even if you do then its evading not avoiding there is a hige difference between that. Using Electrum can avoid the account getting frozen but if the casinos also against the country where you are living and the prohibited users then its don't gamble at all.
That's still the same in the eyes of the law, remember that evasion of taxes is going to be bad and it's not a good time to do that when the government can seize your asset, penalize you for evasion and at the same time a jail time although with a possibility of bail. Another thing that you can do is hire a treasure man if you really want to avoid paying taxes, it's a new but risky method of turning crypto into fiat.