Well it's not illegal to live in 2 countries at once, with open︁ borders it's hard to prove how much time was spent where. If I keep the︂ 2 identities separated, use respective bank cards and phones with local SIMs in their respective︃ countries, do bank transfers only locally within the country, have 2 addresses in the respective︄ countries, cross borders in cars, use local proxies to access bank accounts, use cash as︅ much as possible, the only common link is a passport.
Once I gain a second︆ citizenship, with a name change / localization, it should be virtually impossible to link those︇ two persons.