Who is Pavel Durov and what led to Telegram founder's arrest?

Pavel Durov, Telegram's founder, was detained at Le Bourget Airport, France. The arrest is linked to allegations regarding the app's inadequate content moderation leading to criminal activities. French authorities have remained silent on the matter, while Russia seeks to clarify the circumstances. Telegram hasn't issued a statement, keeping Durov's future and Telegram’s policies in the spotlight.