

Yes, actually there is a legal way to do this through the European citizens initiative. If you can organise a campaign across EU countries and obtain enough support, the commission must consider your proposal.
https://citizens-initiative.europa.eu/_en
https://en.wikipedia.org/wiki/European_Citizens'_Initiative#Procedure
Unfortunatelty, its difficult to be heard because people does not really know about this posibility and usually understands it like a petition, which is not. Even very organised groups struggles with it, but theoretically is possible.
We don’t need an app for everything. Humanity have dealt with mesturations for millenniums without them. Even locally stored data can be used as evidence if the device falls in wrong hands.
The best way to protect your information is to keep them in your head.