It depends what kind of tax. If you pay rent from using land that's like the most legitimate thing that they own the land and you use it so you pay for it. But if they tax your ETF capital gains that you have made in different country from money that you have invested before you started living there then there is not much legitimate about it. Because the moving thing it's kind of cope of digital nomads. Many businesses farms, factories, mines can't be moved so the government can basically tax whatever but that doesn't make it legitimate.