I seriously doubt they're reporting all users automatically. Most tax authorities are still completely clueless and rather busy. In the UK at least you report your taxes. If they don't like it then they'll start enquiring. Up until then they'll take it on trust.

They are of course storing absolutely everything and will happily hand it over as long as the correct applications are made. In the meantime all of your giant profits go to your bank account which will indeed be triggered if epic amounts are arriving.