Since I'm currently almost all in on Select, I don't have to deal with Google. But it always used to be kind of a pain. Google had other book-related services of ill defined purpose, and navigating the structure to figure out where to post your books for sale was in the beginning a little bit like navigating a labyrinth in which there might or might not have been a minotaur. It got better later.
But then Google went through periodic phases where it slammed the door on new indie submissions for months at a time. Then, of course, there was the erection of all kinds of barriers so that you couldn't reach Google through an aggregator. (Amazon has been quirky about that last part, too, but the sales made it more worth it. For me at least, Google sales never came close to Amazon sales.)
Apparently, Google is still being quirky. Some things never change...