Source story from August: https://www.ft.com/content/be6a99d2-22de-48ec-9afa-1d2e2f709...

>Meta also secretly linked user data with other information to track users’ activity on other websites without their permission — despite Apple in 2021 introducing measures explicitly requiring consent, according to Purkayastha’s filings.

That's frustratingly vague, not to mention it hinges on the complaint of a disgruntled employee. Facebook finding some way to bypass cross app tracking restrictions would be much more controversial than if they bought purchasing data (grouped by email) from data brokers, and then joined that with their own datasets, for instance.