Then gamble only at the casinos that are reputable. It's the best and easiest way of knowing that you're playing at the right casino because all of their games are licensed and they are unlikely to commit such acts if they have the reputation to protect.
Avoid the usual new casinos, they're likely the ones that will hostage your funds aside from being worried about their games. I'm not saying that all of them are but many of the new casinos really are shady.