French-Russian tech billionaire Pavel Durov is to appear in court on Sunday after being arrested at a Paris airport for offenses related to his popular Telegram messaging app, sources told AFP. France had reportedly issued an arrest warrant for Durov in a preliminary investigation into alleged offenses including fraud, drug trafficking, cyberbullying, organized crime and promotion of terrorism. The detention has sparked a debate over Telegram’s lax content moderation policies and whether France has the right to crack down on what some observers see as “free speech” in the name of law enforceme…