This is against law regulations in many countries (i.e. Holland). Why then? What is the reason behind?
I can, somehow, understand cornfields, lakes etc., because you can easily avoid those, when you have your head open. But, leading a biker against traffic on a one-way streets may easily get him into a serious problems. And isn't that easy to be avoided.
Is there any reasonable explanation, why it was implemented (not removed yet) in Google Maps?
Here is an example blog article, that the same happens when using bikepaths in London.