The author of the tweet exaggerates a bit, writing "Guess what does not require user opt-in: Apple knowing every single transaction made on its devices and using that information to target ads".
He's clearly trying to insinuate that consists of payments on websites, Apply Pay, etc. but is simply app store and in-app purchases. Apple's "Search Ads" that the tweets refer to are literally for the app store search bar.
He's clearly trying to insinuate that consists of payments on websites, Apply Pay, etc. but is simply app store and in-app purchases. Apple's "Search Ads" that the tweets refer to are literally for the app store search bar.
See: https://searchads.apple.com/