I think another important factor is that what's a viable business to one party isn't worth it to Google simply because they can use that engineering talent more effectively in a monetary sense elsewhere. Even spinning them out doesn't make sense from a numbers perspective. The big problem with that is that they utterly ruin the landscape for everybody who isn't Google and who would operate just fine if it weren't for the size 20 boots giant that tramples all over the space before giving up on it.