Housing crisis + zoning laws preventing more construction + taxes based on deal size

My family bought a few apartments in Frankfurt while interest was still <1% in the pandemic. Every private seller wanted to pretty up the deal with "favors" aka physical bank notes. It was actually insane. We looked at a nice place where literally all neighbors above, below, right, left were american & british private citizens - people where bluntly asking "don't you have something for me" at the very first visit. Completely bananas.

This law has literally nothing to do with Bitcoin. They just want to make sure they don't miss a single euro to be taxed.