Studies have shown that most of the profit from online sports gambling for example comes from people with gambling addictions. These companies are just greedily sucking away money from vulnerable people. These companies really do ruin lives and destroy families.
I can see that maybe prediction markets might offer at least SOME value to society, so if I were made global dictator tomorrow, I wouldn’t ban them right away, but I’d definitely want to see more studies doing a risk benefit analysis.