Freedom of speech means very specifically being free from consequences/prosecution from the governing body, and makes no claims about speech in the private sector or private houshold.

To focus the scope, it means openly criticizing the governing body is protected and not a punishable offense _by the government_ (people can and have been let go for political posts on social media written from their home, if the employer felt it was damaging to the company's reputation).

And no, literally billions of people in the world do not have that right.

That's not a definition, it just constrains the universe of possible definitions. Hence you can't come to this conclusion because you still haven't defined it well enough to say who in the world has it and who doesn't.