More likely is that content providers would pull out of countries that implement "sender pays". The countries that want these taxes are, in general, marginal revenue streams (Africa, Middle East, etc).
Note: this may be the goal of the totalitarian regimes all along. They could not be accused of censorship when Twitter, Facebook & the like pull out.
Media - music, news, movies - from the West (Western Europe, US) is one of the many things that sparked discontent in Soviet-bloc countries. It countered much of the propaganda put out by the "workers paradises."
In more current times, putting out video, images, and information has shed light on atrocities that are going on around the world. Some of it drives people to action.
Anything the regimes can do to cut off communications is a win for them.
Note: this may be the goal of the totalitarian regimes all along. They could not be accused of censorship when Twitter, Facebook & the like pull out.