Business is business they always do this to earn more profit and invite others to join their platform. It is only you if you want to get persuade by them but still it is a bonus which is free money (but still you can lose it) and it will trigger you to deposit money to play more. I remember those crash games that I've played and its my first-time , they have daily faucets which I thought i wont be get persuaded by those promotion and wont deposit money but after a day I'd deposited my money and lose it all.
And that is very common, since it is not rare to receive a bonus and if we had bad luck we may lose it relatively quickly, and as such we are left with an unsatisfactory sensation and then we may make another deposit, still as long as we are not betting an amount we cannot afford to lose then there is nothing wrong with that, however there are some gamblers which make a habit of chasing their losses and this can be dangerous as when you are not thinking clearly that is when massive losses can be incurred.