The problem is that most European schemes are country specific. As soon as you cross the border even to another European country, your options are pretty much cash or Visa/MasterCard.
In practice, people have started to accept it in Portugal, Argentina, Uruguai and some other places where people tend to have accounts both in their countries of residence and Brazil.
Also, Verifone PoS in the US will also accept Pix as well.
0: https://www.ecb.europa.eu/euro/digital_euro/progress/html/ec...