The bold question makes me think that you are the one who is new to gambling. Deposit bonuses are not only on the first month of opening, deposit bonuses in most casinos is something that being offered all the time as it is a way to attract new players. Indeed, not all casinos provides deposit bonuses as casinos has their own way to attract players.
Did you miss the word in red? Does "usually" mean "only"
I'm also aware that casinos offer deposit bonuses at any point but I only said first month since DNL insists that Rollbit is new and implied that it has to offer deposit bonuses. Scroll up.