https://techcrunch.com/2023/01/11/meta-ads-legal-basis-dpc-final-decisions/

Privacy watchers keen to dig into the regulatory reasoning underpinning two major decisions against Meta earlier this month — which struck down Facebook and Instagram’s claim of contractual necessity as a valid legal basis to run behavioral advertising on users in the European Union — can now sift through the detail after the complainant, privacy rights group noyb, published the decision documents online.

You can find the 188-page Facebook decision here and the 196-page Instagram decision here — both of which feature redactions made by Meta as it was allowed to  remove commercially sensitive information so some juicy details are missing.