Earlier quoted context omitted.
I still don't see why not. Maybe it's what GDPR says, but it's wrong and I can't see this being enforced. If data collection is the "payment" for using the "service", you have two choices: you don't pay and don't use the service, or you pay up. This is like saying a business can't make usage of a service conditional to payment.
"In the EU, personal information cannot be conceived as a mere economic asset: according to the case law of the European Court of Human Rights, the processing of personal data requires protection to ensure a person's enjoyment of the right to respect for private life and freedom of expression and association". https://edps.europa.eu/sites/edp/files/publication/16-09-23_...
It's funny though, to watch everyone talk about how people should own their data in these threads. And there's the EU proclaiming plainly that you in fact do not own your data and may not do with it as you wish.