I'm not from the US but I also started investing more into stocks and ETFs that exclude American companies.
Even if the US somehow manages to overcome the 4 years of the Orange in office, I'm tired of the monopolies of American mega-corps, and I feel like more and more people are starting to think the same.
Revolut is great, but more like a banking servive than a payment service. You'll get virtual credit card details that you can use to pay, just like with regular credit cards. Haven't used N26, but I think they're similar from what I've heard..
Klarna is widely used, but I heard they can be quite predatory and make it very easy to make debt, which they then use to squeeze hella fees from you until you paid everything off.
No idea about Bunq.