Sounds like Meta wants to force you to give them your phone number.
How do any social media companies operate if that’s the law? Most don’t federate.
X, Facebook, LinkedIn, Reddit, etc don’t follow this law.
Did you know that Reddit’s newest chat function technically uses Matrix? Boom, the capacity for interoperability should the EU come down on them. That’s just one example of the background ways companies are preparing for this.
To learn more, the EU has put together a helpful site at this link.