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European Union set to revise cookie law, admits cookie banners are annoying
(www.techspot.com)
This is a most excellent place for technology news and articles.
No, selling would also not be allowed via a cookie banner as the cookie banner doesnt address that.
GDPR already doesnt allow usage of PII which you cannot find legitimate reasons for. Just selling PII is never allowed as you will not find a legitimate reason for doing so.
But the cookie banner can allow more invasive tracking via setting tracking cookies which can be covered under legitimate interest for the operator of the website themselves.