Just be aware and always read the ToS, casino nowadays are using this method to encourage user to deposit thinking that it will be just a regular deposit bonus. Always read the fine print.
Yes, that's a very useful advice to everyone, and I believe everyone should follow it to be safe from such ToS issues. It's not really a good thing that some casinos do and that's why a user should be aware of such things before making any deposits in order to gain advantage from the bonus.
Most times there's always a clause to whatever that seems too good to be true, so it's very important to read between the lines to find out what it is. Most of us makes the mistake of not diligently reading through TOS, we might just hurriedly glans through without really making sense of what is written. These gambling sites wants to entice their customers to make deposits, that is why they'll give them bonus promises, and the gambler will be excited to claim it, not knowing that there's a price before they can use the bonus. It's a lesson for us to always scrutinize anything that is a giveaway, whether it's favorable to us or not.