The key points could be how you react when other users report these activities to you, or you have tangible signs that would be suspicious to an average reasona

The key points could be how you react when other users report these activities to you, or you have tangible signs that would be suspicious to an average reasonable person. These problem would be the same if you had a hot dog stand and customers reported to you a child prostitution ring massively buying your hot dogs for the kids. What would you do ?