Telegram CEO Pavel Durov is reportedly in custody after being arrested near Paris Saturday evening as he was departing his private jet. The billionaire was apprehended on a warrant related to a preliminary investigation, writes Reuters.

French authorities believe that the platform’s lack of moderation has “allowed criminal activity to go on undeterred on the messaging app.” Durov will go before a judge tonight and could be indicted as early as Sunday, according to sources for TF1 TV (which we read using Google Translate), one of two French outlets cited by Reuters.

Telegram has become a critical resource as people turn to it to find crucial information in places where heavy information censorship is common, such as Russia. But Durov’s preference for hands-off moderation has also helped make it a haven for bad actors, with the platform only controlling its content when it’s forced to do so by other governments and organizations.