Is that not only the case for consent as legal basis though? If you're signing up to a service, then surely they can use fulfilment of a contract (with some very expensive lawyers drafting some nice ToS language), or legitimate interests (i.e. argue that a social network relies on real names etc to function)?

I see this turning into an in-app clicking contest though soon, a card comes up in the app with a little description, a cutesy graphic, and a "Consent" "No Consent" box to click before you can get to the newsfeed.