This is fine in theory, but in practice you'd visit some site with an opt out cookie that gives auto approval just by visiting said site, who would then sell th

This is fine in theory, but in practice you'd visit some site with an opt out cookie that gives auto approval just by visiting said site, who would then sell that to one of the huge adco's, and nothing would change. Adverts pollute our lives in many ways, it's past time we stopped them IMHO.