I fully support your argument and can't understand why people in this thread assume the EU doesn't have millions of programmers who can bash out a chat app, one of which would rise above the others and get a critical mass of users.
Sometimes I think it would be good for Meta, X, Google etc. to lose market share in the EU and UK. It's ridiculous that we're beholden to one country for so much software, and they're all being actively enshitified anyway.