I wondered that too

Con games ... financial fraud ... pedos contacting minors not permitted under state law ... stalking inconsistent with restraining orders ... communications by fugitives ... and the best ... online Harassment, as defined by NY, CA and MD law

It really depends but they did something against the sites TOS.

Sex trafficking.

Selling weeds and talking about vandalizing property and people to get money for it. One guy confessed that.

Unsolicited dik pics

FYI.. they love the dik piks ..

Sodomizing beagles

the guidelines and legal pages should tell you what is considered suspicious and illegal.

Maybe farted