You're free to dissent as long as:
- You don't actually represent any real threat to "The Powers That Be". The moment you become effective you'll be shutdown real fast.
- You're not one of the "unapproved" minorities. This differs from country to country. But can be just being gay, black, indigenous, poor, having a different world view.
- Your being missing will be noticed. And even then that might not be enough. The disinformation campaign about you personally (character assassination) will start just before (1) unfortunate car accident, (2) Strontium meal or (3) falling off a boat at sea.
It won't matter if you live in 5 eyes country, 14 eyes country, Putin-empire, Chinese-empire, or any other state.
The only space you own is in your skull.