Perhaps most significantly, these latest guidelines clearly state that Cookie Walls are prohibited and that the EDPB does not consider consent via scrolling or continued browsing to be valid. 

Explicit Form (where the purpose of the sign-up mechanism is unequivocal). So for example, in a scenario where your site has a pop-up window that invites users to sign up to your newsletter using a clear phrase such as: “Subscribe to our newsletter for access to discount vouchers and product updates!“, the affirmative action that the user performs by typing in their email address would be considered valid consent.

it has been inferred by many that the validity of consent could degrade over time