That's not evidence that its encryption algorithm is well designed or secure.

it is circumstantial evidence. Isn't it should be a red flag if one messenger is prohibited in a country with an authoritarian regime, and the other is not?

I mean that's enough for my social messaging. If I'd need to transfer some top secret information, I would use neither of them.

> Isn't it should be a red flag if one messenger is prohibited in a country with an authoritarian regime, and the other is not?

No.

If you want to use less information than available for your decisions, it's your choice.

That was before WhatsApp started using Signal protocol.

How whatsup using any protocol relevant to telegram being banned?