It used to have issues, they have improved since, but I don't consider Telegram to be encrypted or private (and I'm also not a crypto expert, so the details elude me anyway) so I haven't really kept track of this.

Honestly, the issue was not about their crypto at all, but about the attitude and how they reacted. It's literally as if someone says "dude, I know a thing about crypto and you might've made a mistake there" and Pavel immediately goes into offensive defense, preaching how they have the best ACM champion PhDs and shifting the burden of proof, basically a canonical Putin/Trump-style of evading an argument.

That's what makes me wary of this guy, not his product.