They can fine apple and google for offering signal in their app stores, until nobody has it installed.
That doesn’t break your comms today - but later, you replace your phone, can you get a current copy of the app?
I can download the Signal APK from their site.
Not quite. It would be illegal for Signal to continue operating in the EU if they don’t implement the required scanning functionality. And Signal has already stated that they’d rather leave the EU.