The EU is an authoritarian state. Nowadays it is only nominally democratic, with a bigger and bigger wedge between the ruling elite and the population.
What makes you think they won't filter out means of private communication?
It's just an electronic box from china.
I can fully see them eventually making it illegal and enforcing a new encrypted protocol to which they have the keys for. Obviously, such a setup would leak, but the people who make these rules think they are flawless and omniscient and think they could keep such keys private into perpetuity. They also assume that future government won't be even more totalitarian than them.
It is possible, and even in a democratic way. When large enough majority, defined in constitution, votes for destruction of democratic constitution, it is still a democratic process. It's a known bug of the usual democratic systems.
IMHO, they will only be able to spy on regular citizens. Obviously, this is not a reason not to lobby against the law.