Earlier quoted context omitted.
Durov was notorious in Russia for refusing to cooperate with FSB (successor to KGB), too. I remember when FSB asked him to give access to protester communications on VK (in 2011 during mass protests), he mockingly responded with a picture of a dog with its tongue out (showing your tongue means "I won't give it to ya" in Russian culture). That's why he left Russia, because he felt he'd get arrested soon. Quite ironic…
And my intuition is that Telegram is going to become banned in Russia soon, as Youtube is being banned now and Telegram is the last popular application where you can find the content about war, protests or elections that govt doesn't like.
The fact of Durov getting arrested could be also used for propaganda purposes (no free speech in the West).