But Apple's privacy policy is very clear that they do share user data and they do use personal information for advertisement purposes: "Apple and its affiliates may share this personal information with each other and use it consistent with this Privacy Policy. They may also combine it with other information to provide and improve our products, services, content, and advertising."
Does Apple collect less data than Google? Almost certainly, Google is crazy good at it. But are they still collecting data and using it for targeted advertising? According to their own privacy policy YES, yes they are. Including tracking people on their websites: "Apple’s websites, online services, interactive applications, email messages, and advertisements may use "cookies" and other technologies such as pixel tags and web beacons. These technologies help us better understand user behavior, tell us which parts of our websites people have visited, and facilitate and measure the effectiveness of advertisements and web searches."
It really doesn't match their heavy privacy-first marketing push of late.
And for things like Siri it's hard to imagine that they aren't going to get increasingly creepy on the data collection aspect of things. It's sort of necessary to build out a "real" assistant. Asking things like "What time is my flight?", which is a useful feature, requires it to know when your flight is. Which you probably didn't manually tell it, because that's not very assistant-y, but instead it had to crawl your emails to find it. That ends up being creepy data collection. They could do it purely on-device, but then your homepod can't answer the same question, which breaks the magic. Unless they build some way for the homepod to ask all your other Apple devices. But if all your devices form a collective network that can share data about you between each other is it really "purely local" anymore? And what stops Apple from joining in on that mesh network whenever they want?
So, does it really matter if Apple doesn't directly operate their advertising business and instead outsources it?