You can stop those people who are really fan on trying out new casinos, they might be aware of the risk but it isnt bad to test out because you cant tell sites legitimacy if you wont try and some of people wont really mind that much.
As long as they are aware of verification methods, it should not be a problem here. Those who are blindly rushing in to deposit without checking anything about the site are the ones at risk. But it is always safer to go with the well established casinos and not the new ones.
On my case i do let others test out and hear up for some feedbacks before trying to play into that place.Of course having a license to operate does
really matter but imho most of sites now doesnt have that thing but somewhat they are still being trusted by the community.
In that sense feedback is an essential thing for the development and growth of any new casino. Without having community feedback how would they expect to grow. But in retrospection, such casinos would not be a scams.
It is always encouraged. But like I said, one needs to be diligent before stepping into new waters.