Quite concerning. IIRC Telegram is based in Russia. And Russia has been trying to ban the app. Maybe they just decided to shut down the company itself. It's within the state's power anyway.
You IIRC incorrectly. It is not based in Russia. Moreover, its founder got relieved of his business (VKontakte), by a state affiliated oligarch, whereupon he bought a passport from St Kitts and left Russia to never return. So he’s pretty pissed at the regime.