Yes; sites with Apple Pay get purchases from me almost instantly.

It's a good way to battle people otherwise preferring to use a platform they already have an account on (e.g. eBay; Amazon) where you lose more on commission.

Etsy has done extremely well with this!

If my SO or I are talking about something there, it’s an almost certainty that one of us will press thumb to purchase. It’s too easy.

Not really what being compared here though. eBay, Amazon run the whole site.

Amazon operates a payment service, and eBay used to. Using Amazon to pay doesn't mean you're buying something on amazon.com, just as using PayPal to pay doesn't mean you're buying something on ebay.com .