For e-commerce and digital goods (i.e. courses) sales, PayPal is the preferred payment method in EU. Given the choice, we see EU customers choosing to pay with PayPal instead of Apple or Google pay about 50% of the time. Stripe doesn't want to lose out on these sales.
I forget that Apple Pay is even an option online since I use Firefox. Not sure why Apple wouldn't open those APIs to third-party browsers, they make money every time someone uses Apple Pay.
