I'm not in agreement with that. The banners are an effect of shitty companies being shitty to their customers. They already put as many annoyances and dark patterns on their website as they can, with or without GDPR: newsletter subscriptions, opt-in as default, multiple trackers.

Those banners are merely the effect of shitty companies trying to cover their asses and being non-compliant to a law that's actually sane.