He made $260 million in Russia creating a copy of Facebook. He sold his shares and resigned.
But wait, he didn't _really_ resign. No, it was all an April fools joke! The investors didn't buy it and fired him.
He claims the site is now under the control of Kremlin because one of its shareholders is Alisher Usmanov, an alleged ally of Putin. Yet, that guy was a shareholder for awhile now and Durov never complained about him.
I don't know. Sounds like sour grapes to me. Sounds like someone is trying to stay relevant by creating controversy and generating hype for a new messaging system that's supposed to protect you from government's eyes.