Not a good analogy. Google isn't tacitly endorsing those websites. It is endorsing things in its store, at least to the level of "we think it's worth taking the vig for this".

Probably prioritises them very low, so they do not rock up in a lot of searches. Maybe puts them on the old server in the corner of the room.

There is a website that lets you search minus the million most popular websites, and it is very different.