I mean, even democratic countries are using mass surveillance, not just autocratic ones. So I think, just like with mass surveilance, this “Social Media Investigation” would become the next step in the evolution of how technology is used against us, every country is gonna start scanning your social media.
Saying Israel has no right to exist is covered in an isolated sense in every EU country I can think of. It only becomes a problem if you say or imply that committing genocide against Israelis is a “solution”, or otherwise advocate for violence or hate crimes.
Saying that “a two state solution can never work, Israel should be absorbed by Palestine and other neighbouring countries” is a legitimate political opinion that is protected by free speech.