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For starters I've never heard of Adyen until just now. So, perhaps better marketing?

It's pretty popular in the Europe and is a Dutch company.

Its only "popular" because for a long time it was the only choice in Europe pretty much. In several countries it still is.

It also was total garbage developer friendliness wise ~5 years ago.

Well, Stripe still isn't available in like one quarter of the European countries.