As of now, there are no solid plans to block messaging services in Europe. The proposal in the EU's Act on Content Moderation suggested the potential chance for blocking messaging services.
Hosting on own messaging server or relying on the global matrix servers is still grounds for debate.
It shouldn't be on Signal and co to stop operating in the EU, it should be on its citizens to stop operating the EU.
Most legislation of its members comes from the EU in a rather undemocratic process. I have lost faith in the idea for it not to become bureaucratic madness. The bad does outweigh the benefits.
What happens from dumb cases like an IRC server to more "complex" cases like running my own "matrix" servers?
On a more serious note: Nicola Gratteri, an italian magistrate known to be the most wanted (dead) by the mafia in italy, has said in many occasions that the mafia has strong enough funding (duh) and competencies to "build their own whatsapp", as in building its own telecommunication network for covert communications outside of mainstream/public services.
Funny how the article gets the small providers like signal as example as if Messenger, WhatsApp, telegram shouldnt be responsible for all the crimes they profit from
Hosting on own messaging server or relying on the global matrix servers is still grounds for debate.