When Google collects data on you, it's mainly so they can let other companies interact with you (ads), and those companies pay Google so that Google makes money.
When Apple collects data on you, it's mainly so that Apple can interact with you, and get you to pay Apple so that Apple makes money.
The existence of that third party in Google's motive (i.e., advertisers) incentivizes Google to collect data more aggressively, because as long as the people using Google are "happy enough" to not leave the platform, Google stands to benefit from collecting more data for advertisers. And "advertisers" isn't a well-defined demographic.
Apple's cost-benefit analysis when it comes to collecting user data is much ore clear-cut. If they can't tie data they're collecting to more revenue, there's not as much incentive for them to collect that data.
In my opinion, that's why the reporting earlier this year about Apple's pivot towards advertising is such a big deal[1]. It completely changes the relationship it's users have with the company.
1: https://www.bloomberg.com/news/newsletters/2022-08-14/apple-...