Freedom of expression has been of a limited nature already for some years (just cast Israel in a bad light in USA and see what happens). With the coming wave of AI-powered surveillance, which may be even powerful enough to read your sexual orientation from examining direction and duration of glances in survtech feeds, we just need a small misstep (say, another twin towers-type catastrophe) for even freedom of thought to become a privilege to be had in isolated and protected places.
Source: I write dystopias on the subject. https://w.ouzu.im