I think you miss the point.
EU can’t ban E2EE messengers, we are not yet at a point where an EFW (European Firewall) is being even considered.
But deplatforming will go to great length to reduce Signal’ appeal. It will be seen as a “criminal platform”.
As said in Google Photos dilemma, Privacy is collective. I can always find Signal apks and download it. Now good luck if I want to communicate with iPhone users, and good luck to explain how to install apks to my grandparents.