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

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.