No.
Tarrifs are free in neither sense of the word.
They are not "libre" free as any two parites are not free to trade with each other in any way they both choose without imposition by the state.
And they are not "gratis" free as you are required to pay a tax to the state.
A client where users are required to pay for speech that users can freely join is clearly not "gratis" free but will be "libre" free so long as any users can join and there is no restriction on what they can post.