if everyone started to use p2p messengers with asymmetrical encryption, the EU would have very little they could do
Totally agree with you; a p2p network is resilient and unstoppable. Every user acts as a node within the p2p network, and as long as people are actively online, it can survive. This means it cannot be banned by any country or government.
Plus, since a P2P network is a decentralized network, there is no central server to store user data such as chat histories or contact lists**. From a data privacy perspective, nothing can compare with a p2p network.
I know people are quite familiar with Signal and Whatsapp due to their E2EE services. However, they are managed by tech companies and utilize a centralized network (central server = another computer). All your chat histories and data are kept in their giant computer/server. Even though it is encrypted, who in the world knows if they have memorized your private key (I think they do, by the way, because governments need these things to monitor suspicious activities or potential criminal incidents).
So, start using applications that operate on a decentralized P2P network; it is the safest way to safeguard your privacy rights.