1) accept advertising/tracking cookies
2) pay a monthly subscription
I've seen this on AlloCiné (French IMDB), and "aufeminen" which is a random forum that a Google search led me to.
> Consent is presumed not to be freely given if it does not allow separate consent to be given to different personal data processing operations despite it being appropriate in the individual case, or if the performance of a contract, including the provision of a service, is dependent on the consent despite such consent not being necessary for such performance.
I take this to mean that you cannot rely on consent that a user has given you to process their personally identifiable information if they did it in order to access a service you wouldn't let them have access to otherwise.
https://gdpr.eu/Recital-42-Burden-of-proof-and-requirements-...
I think having to pay a monthly subscription, or losing access to a service when you withdraw consent and don't pay a subscription should be regarded as a detriment.