Almost all of these are 1st or 2nd gen European diaspora, or the spouses of such people, who 1. still have financial ties to the European country from which they originate through inheritance of assets from their parents/grandparents 2. have citizenship through descent.

The amount of "unaffiliated" Americans who move to Europe is probably negligible.

You'd be surprised. I personally know plenty of American LGBT+ people who are at least considering moving to the EU, simply because recent political developments has made the US an increasingly-unsafe country for them to live in.

Wouldn't this (unsubstantiated claim, but let's play along) be more troubling though?

It would be one thing if people who are "unaffiliated USA citizens[0]" moved to an imaginary place where the grass is greener. You could argue they don't know about all the problems of that place.

It's maybe more concerning if the people who flew Place A, because of all the problems of Place A, looking for greener grass in Country B, are looking around and going "hey you know what? Place A wasn't so bad after all. The grass only looked greener because it's plastic!" and then go back.

[0]: let's acknowledge we're just talking shades of the same color, when referring to a country that's 250 years old. Nobody's "from there" really

My family has been in America for... I dunno, 8 generations? A long time. I'm moving.

I don't have any connection to Europe. I just don't want to live under America's increasing fascism and would rather contribute to a just society.