That is your on experience and I have also experienced in the situation whereby I deposited money to a casino and I was asked to wage before the bonus appears. So every casino has their own method but the best method is the registration bonus without deposit and also with the deposit. Once you deposit there is guarantee that your bonus will appear and you will be asked to claim it. Or once your deposit, the bonus claim link will pop up for you to claim it. And according to niyvi, those who registered before the $10 spin was introduced can't have it but those who registered after the implementation so I was not lucky to have it. So I don't have any input on that foe now but those who just registered within this 3 days can testify about the bonus.
In bonus issue you can bring one experience to judge another because all have different ways of doing it. You can register and enjoy the benefits now.
The Case I mentioned was just one among a generally accepted Case of most online casinos, although I have to agree with the fact that every casino with it on terms and conditions regarding bonuses, line what you said In the first paragraph that some casinos will release your bonuses after you meet certain wagering requirements, or when you have finished playing with your deposits money, what I do not know with that kind of casino that release gamblers bonuses after they meet certain wager requirements, to activate their bonuses, the question is, do they're still ask for another wagering requirements when you win with the bonuses and want to withdraw?