Quoting GDPR:

"Consent should be given by a clear affirmative act establishing a freely given, specific, informed and unambiguous indication of the data subject’s agreement [...]" [1]

"Consent is presumed not to be freely given [...] 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." [2]

[1] https://gdpr-info.eu/recitals/no-32/ [2] https://gdpr-info.eu/recitals/no-43/