That is the scary part, these "deposit bonus" ads are getting out of hand. Since there are a lot of legit places that actually give a good deposit bonus which usually requires you to gamble there for a while to actually be capable of withdrawing it became so famous. The legit ones are actually good because in any case either they are going to get the money back because you will fail to gamble with it and lose it or even if you manage to win enough and withdraw they gained a customer, so the money they give out that way actually pays itself.

However, the bad people who saw this as opportunity realized that they can make huge claims like 5000 euro for 1000 deposit and whatever and since there are legit ones it either scams people who believe it or makes the legit ones look bad.