People don't know whether they are or are not doing things that require consent under the law. That's because, if you haven't noticed, the people concerned are computer programmers, UI designers, and PMs. Notably missing from that list is "lawyers who can be bothered to research the question".
People put the banners up because they see other people doing it and it seems safest. That all of this would be so should have been perfectly obviously to whoever contemplated bringing the regulation into existence. Therefore they are either imperceptive or malign.
People put the banners up because they see other people doing it and it seems safest. That all of this would be so should have been perfectly obviously to whoever contemplated bringing the regulation into existence. Therefore they are either imperceptive or malign.