Seems like the US has figured it out:

>If you're paying a million euros of income tax a year in France, Italy is very tempting. As for US citizens, Americans are always taxable on worldwide income, so moving to Italy would not help their tax bill.

This characterization:

>selling for an unsustainably low price)

also applies to previous governments and voters that approved defined benefit pensions and retiree healthcare that needs ever growing populations to fund it.

I can see the situation just as easily be characterized as “avoid being liable for an unsustainable debt”.

Income and assets are different though. They will tax what you earn, but they aren't trying to tax your net worth afterwards. Idk how France can go after the assets of people who move.