Earlier quoted context omitted.
Thank you for the citation; this is an interesting and useful discussion. The contract that Facebook has with its users is not merely to serve as their social media platform. The contract includes personalized advertising. Facebook, in the terms of their contract with you, give you X in exchange for Y. X is the social media platform. Y is personalized advertising. This is the contract. AFAICT from the GDPR, they don'…
From same source: "The processing must be necessary to deliver your side of the contract with this particular person." That is - these regulations refer to the performance of a contract by the service provider . If the data isn't necessary for creating the sandwich, you're not allowed to deny use of the service based on the user not giving you the data. GDPR was specifically written by smart lawyers and regulators to…
You seem to be trying to say that Recital 43 rules out certain types of items as being part of the terms of a contract between a person and a service provider. Namely, the term `you will be shown targeted ads` is an invalid term in a contract. (If this is a misunderstanding of your position, please let me know.)
But this is not what Recital 43 actually says. Recital 43 talks about the performance of a contract. It does not speak to the terms of a contract.
The phrase "performance of a contract" is, I believe, a specific thing in contract law: it refers only to the execution of some established contract.
If Recital 43 or some other part of the GDPR wanted to limit the terms of legal contracts to exclude targeted advertising, they could have done that. But they did not, AFAICT.