when a gambler is looking for a wager-free bonus in such a way that they can just deposit into the casino claim the bonus and then withdraw, not knowing that such a casino does not exist and if you see any casino that offers such too good to be a true offer, there is a high probability that their end up scamming the gambler.
Then I would say it was also the gambler's fault to not be careful with his money depositing it in any place without further reading terms, conditions or the reputation of the casino. Of course the scammer is always guilty and despicable, but we can't expect the world to be perfect in a way we can believe anyone who crosses our way, especially on the internet, which is a no-man's-land and all care isn't enough. After all, gamblers can cry loud as they wish, but nobody will listen to their concerns after the scam and the thieves will most probably run away anonymously on the vast deep ocean of the internet where we never know who we are dealing with. So the best and only alternative is to stick with trustful platforms, which already have positive feedbacks from its customers.
The temptation of not reading the terms and conditions of a casino when we are curious to gamble and make money is very high. Based in analysis, 77% of gamblers do not read terms and conditions of a casino when they want to make there first deposits and bet. This can happen to another body whether a pro gambler or not. We might think that every other casinos we have been using are the same with the new one when it comes to terms and conditions. This is what many gamers and gamblers normally think and end up making the ring choice of using a bad casino that doesn't pay there customers and having a strict rules.