You see, the state simply claims to be the workers - or rather their chosen representative.
Therefore, since the state owns everything, the workers must own everything. The GDR was so far left, they even ensured workers wouldn’t accidentally self-harm their means of production through strikes, how kind of them.
The EU plans to do so and as such every member must follow it.
And once encryption is criminalized, it can be trivially detected - or at least assumed to be encrypted if your message is sufficiently random.