It's illegal, but legal if licensed (quantum physics has nothing on legal systems) or on a temporary basis and small scale (town fairs, hobby club raffles, etc.

It's illegal, but legal if licensed (quantum physics has nothing on legal systems) or on a temporary basis and small scale (town fairs, hobby club raffles, etc.). The main issue is that the games allow (and target) minors to play, which is never allowed, and that they do not provide any measures to protect players against themselves (such as maximum gambling limits).