They do the same with Google App Engine. They pretend their cloud platform scale but, because of quotas, a GAE app can't scale much. Technically it can, but not

They do the same with Google App Engine. They pretend their cloud platform scale but, because of quotas, a GAE app can't scale much. Technically it can, but not without Google's permission. And they have no contractual obligation to let their customers' apps grow, it's legally just a favor they might offer to whichever customer they fancy. So this Google+ quota isn't surprising, coming from Google.