You do realise Telegram isn’t secure (non-e2ee), is Russian owned and is based in the Middle East. Enjoy whatever privacy that provides.
Mmm...
You can use end-to-end encryption with Telegram if security is your main concern.
I don't see how it being "Russian owned" is of any concern, but if you feel like privacy is an issue then you're free to claim their $300,000 prize at stake or just take part of their ongoing bug bounty programme and be rewarded by spotting flaws.
Don't need to rely on a vulnerability or flaw, when you own/have the keys to the kingdom as it stands.
Based in the Middle East instead of Russia, because the founders specifically care about avoiding Russian government censorship
And they picked a country known for its poor rule of law, constitutional protections and respect for privacy.