

Oddly, the EU one just has a checkbox that you need to check to confirm that you haven’t signed before. I’m guessing removal of duplicates happens only after closing, along with other data validation.
I thought this strange at first too, but I think it’s because of the disparate identification methods in different countries. If everyone had a digital ID card instant checking would be doable, but note it probably isn’t.
Interesting! I tried from a country that has an eID so it should be trivial to weed out duplicates, yet I got that checkbox.