But actually it does. For example Romania and Malta have their dual tax treaty working favouribly.
Every country has their own compensation policy now, adapted to the pecularities of each country's taxation and tax treaty agreement between that country and Hungary or Malta.
I am based in Italy, and we can discuss at length as to how taxes are handled in Italy under a Maltese AOC. It all comes down to one word missing according to the Italian authorities. The Romanian one applies it differently and it's advantageous for colleagues based in Romania.