Earlier quoted context omitted.
I'm pretty sure that this kind of behavior will be shot down by EU or Local courts. The GDPR contains parts where it explains what kind of reasons might lead to overriding of legitimate or critical interests.
If this is the case, I imagine a lot of profitable sites will be geo-banning EU users who don't subscribe to a payment plan as a non-profitable drain on resources.
The GDPR does forbid hinging service quality/availability on consent but I don't think it forbids putting it behind a paywall as alternative.