> I'm curious to hear the additional monetization Apple plans to get for this.

I don't think there will be any extra monetization - this is presumably just an API in a future iOS 15.x that can be enabled via entitlements Apple assigns, so unless Stripe says "extra 0.3% fee for iPhone PoS payments" they likely won't make any money from it. Think of it as a funnel for getting the last 20% of businesses to accept Apple Pay.