Yes there are two separate bases for processing of data, but the point is that consent cannot be bundled and made a precondition to another form of processing i

Yes there are two separate bases for processing of data, but the point is that consent cannot be bundled and made a precondition to another form of processing i.e. to provide a service. Put another way, Facebook should not make the provision of a service (which technically should not require usage of data for other purposes i.e. marketing/advertising, ignoring any business model points) conditional upon providing consent for that other form of processing. Bundling of consent means the consent is not freely given here because the user wants the service and so is less likely to refuse than if the consent decision was isolated from the provision of service.