Banks in the US being okay with giving Apple a 0.15% cut is different than merchants in the US being okay with giving an up to 3% cut to the card networks. First,
the majority of purchases under $10 are still done in cash (and a significant plurality under $25 are as well). Contactless payment has the potential for transitioning a significant portion of that to cards,
as has occurred in other markets. This means more card processing costs for merchants, which already
aren't fans of paying them in the first place.
(Note that I say "contactless payment" here, not Apple Pay. Disabling contactless disables all NFC based payment methods, whether smartphone/watch based or through contactless cards. There is no sanctioned way to only allow the latter while disabling, say, only Apple Pay. Also, contactless cards don't provide any way to identify individual cardholders either as the cardholder's name isn't transmitted--well, unless you insert your card at that retailer at some point, anyway, since the card number is the same as what's on the front of the card.)
In addition, contactless tends to operate over the "credit" networks (Visa/MC), even when a debit card's used. For larger banks, the interchange for both Visa/MC and the domestic "debit" networks (STAR, PULSE, etc.) is capped to the same 0.05% per the Durbin Amendment. However, debit cards from smaller banks do not have such a cap, so contactless transactions with those could potentially cost merchants significantly more than if customers had inserted and entered a PIN. Oh, and unlike in some other countries, the US doesn't have a contactless limit, so it's very possible that people can tap cards for extremely large charges (whereas at least insertion could be required elsewhere to mitigate the additional card processing costs).
Thus, disabling contactless provides the interchange-sensitive merchant with several benefits:
- Smaller transactions will likely still be done in cash at similar levels as now, and if card use for those does increase, it may very well be at a slower rate.
- Even if a card is used, it'll still allow merchant steering of customers to less expensive networks (e.g. showing a PIN prompt and requiring additional customer input to run "as credit" instead for debit cards).
- Allows adoption of a separate payment app by customers, as that's basically their only option other than cards or cash. Such usage of the app may also help in lowering interchange, as mentioned in the article I linked previously.
However, this assumes that contactless usage remains low in the US and that there isn't much of a consequence (if any) for merchants that do disable it. If usage and growth of contactless cards ends up being remotely close to what's happened elsewhere (where
some have gone from zero to 50% penetration within two years), this may end up being a poor bet in the long run.