i wonder ..
When a gambling site gives an offer to give a welcome bonus, they also add terms and conditions to their members. So when a member deposits $XX, they are eligible to get the welcome bonus. If the site has a reputation, that will not be a problem. But if the site is too shady, that will be too risky to use their welcome bonus because we do not know if there are any other terms and conditions behind that.
I wonder do you already search by yourself? I do not know about 22bet but in this forum, you can find many crypto sports betting sites and they have many good promotions you can take but always follow their rule.
most of these bonuses come with conditions to be met before you can see your winnings. but first, you need to find reputable bookies first, from the suggestions above, check also their corresponding thread in this board and you will have an idea what reputation they have or if the gambling community has no existing issues on them.
most welcome bonus have certain wagering requirements, so don't forget to consider such condition because most of the time, players can't complete the wagering requirement because they can lose the bonus earlier than the target rollover.