the same way that they interact with any other web page? which never need banners? You don't need a banner to opt in or out (or ignore).
By this I mean the law is what it is but the implementation is deliberately hurting the visitors in the hope that they will click "yeah sure whatever" to be let through to the content. The harm does not come from the legislation but is deliberately anti-user by the web site owner. (Fine, in some cases it might be out of the box and merely lazy.)
