Although I appreciate the thought here, and I think the investment idea may even be good regardless of what I'm about to say, that's not exactly how this works. If you tax the assets the rich own, where they own them, it doesn't matter where they go. And they can't live in Germany and not get taxed, so they can change citizenship all they want if they live here they will get taxed here. And based off of the most recent studies/reports I've seen (but not read) rich don't actually move when taxes go up - which makes sense. People have lives, family, friends, favorite restaurants and hobby spaces.
The rich will try to dodge the taxes, they may even succeed but we don't have to legistate a bullet proof solution we just have to agree:
- the rich need to be heavily taxed (I'd even say out of existence)
- taxing the rich is possible via various methods
- taxing the rich would solve and/or reverse most of societies problems so everyone should talk and support it.
But yes, I'm a big fan of no outside investment. I'm also a fan of government investment requiring ownership purchases. I'm also a fan of requiring companies to be partially or totally owned by their workers. And I don't think anyone should have a net worth over let's say 50 million.