Great 1% of online stores supports it. I am sure only a fraction of that traffic actually uses apple pay. You are comparing it to google pay that had a terrible UX and like four conflicting versions. They had to catch up to apple pay once it launched. Apple had the perfect product at the perfect time. They complete wasted the US chip switchover. They could have dominated retail purchases.
https://www.similartech.com/compare/apple-pay-vs-google-pay