There are still gamblers that got curious about those new casinos, which is why they test the waters by depositing money for the minimum deposit, which is the start where they can't withdraw it without giving any reason.
Giving this scenario if the amount is a minimum just to test out the services, gambler can move forward, but if the amount was huge and they unable to withdraw the funds, that's really something that should be considered to prevent or avoid to happened. But lazyness is always there when gamblers decided to explore.
So it is better to stick to your own casino, and if you are planning to test those new casinos, wait for other feedback to see if it is good and not scammy, as now it is easy to put up casinos just to scam people, so we should be more careful.
Good point, stick with what you already using or wait for the feedback if you wanted to test new sites, it's better than to lose money if you become a victim of those scam casino websites.