There’s a very large difference between:

- Tracking the behavior of your own users on your own app, for product improvement purposes (which most users will expect)

- Sending the behavior of your own users on your app to an advertising surveillance company, with an ID that can be used to correlate that behavior with behavior elsewhere, without their knowledge, consent, or reasonable expectation

And before anyone says it, no, a generic line about third-party service partners in a sadistically long TOS/Privacy-policy does not count as meaningful consent. Even Supreme Court justices admit that they don’t read them.