Yeah, I don't think it doesn't cause people to leave (certainly no thing is absolute) but rather suggesting that we don't see this to be a large effect in practice. And my understanding of that specific example is that it has some quirks with France's specific implementations as well as the high movability in Europe. Every billionaire has a house in the South of France and can get there relatively easily but that's not so easy in the US despite not being too hard to change state residence (like changing country residence within the EU for good parallel), but country (non-intra-EU) changing is much more cumbersome. Plus, as we've established, if you're American you have to renounce your citizenship to avoid taxes. So... definitely no reason to move to Canada. Just saying...