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.