@Kaiser-Constantin Thank you very much, I haven't looked at them in detail yet, but I think they have a greater credit default risk than $V or $MA. However, they also have a lot of growth potential if they expand their presence and target groups a little. I once toyed with the idea of getting one in Austria myself, but it's still too immature here, it doesn't even work with Apple Pay via American Express, only $V and $MA. But Austria is probably too uninteresting as a target market.
@Kaiser-Constantin I am aware of that, the first part of my answer was related to that, the second to my personal experience in Austria. As mentioned, I have not looked at the share/company in detail, but would probably prefer Visa or Mastercard in this area.