Sure. The criminals and political enemies of the EU will just use illegal chat apps and hardened phones. What about the others though?
the rest? they comply, or get labeled a criminal.
innocent men cannot be ruled over. authoritarians want a population of such "criminals", because then their power becomes the choice of which law is executed on whom.
They don't need to use "illegal chat apps". They can just use Signal or Telegram, or any of the other ways that exist to send encrypted messages.