Back to the topic OP maybe I am too late to join as a casino tester with the bonus OP offers but if it is still open I will be happy to join. As some users said $5 seems not enough to enjoy some Slot games, @NapoleonXBT you can apply the bonus rule without being able to withdraw but the results of the bonus winnings are allowed to be withdrawn. In some previous casinos they also did the same method and seemed to get positive feedback.
It's a test amount, bud. You don't even sweat for it, except registering. They don't need to give you $100...

There are games that all 0.1$ bets per spin, so that's 50 free spins?
Let's be honest, how, many casinos give that many spins even for a loyal player? I think it's better to be thankful for their offer. If you feel it's too little for you, you can always skip past it.