Earlier quoted context omitted.
It's not illegal, they just need to ask their users if it's ok. If there's nothing wrong with this practice, why would the users say no?
If I am understanding this correctly, GDPR means that you must legally accept free riders, ie. you cannot deny service if they don't want it. Mandating companies to serve users who provide no value at all is an example of the regulatory requirements that spill down to hurting regular consumers and workers in Europe. You can see this across all sorts of fields, youth unemployment in Europe (for example) is a mess.
Nope, that's not correct.
Edit: it is correct. Rarely I'm so happy to be wrong.