Earlier quoted context omitted.
> I thought that this was allowed. No, that's one of the big wins of GDPR. You cannot just force the users to sign away their rights.
How is giving choice between paying with money or paying with data forcing users into signing their rights away?
Also, prior to GDPR, the "pay with your data" aspect wasn't even mentioned by the companies. Ultimately, GDPR doesn't prevent people from donating their data - it just requires that it's explicit and not mandatory.