The problem, if and how the Freedom of Speech implies that you can use a certain service you choice. If this implication were true, would it not mean that the provider of the named service has a duty to provide you a access, too?

Why would the provider be responsible for the fact that some government is a piece of shits and tries to restrict people’s freedoms? A private messenger company will always be weaker than a government with infinite funding and resources.

There are messenger out there, which are more privacy as Telegram. Eg. Signal, Threemea, mostly services based on XMPP and Matrix.

I never said there weren’t, I just said that govts shouldn’t meddle in this things.