Android :: Developers Be Liable For Charges For Using Google APIs?

I've been reading the Terms of Service for the Google APIs, both Maps and AJAX APIs. I have questions regarding future consequences of using these APIs in mobile apps that get distributed, hopefully, to many thousands or millions of devices.

Both say that the services must be available for free, so I'm assuming that means you cannot charge a fee for an Android app that uses these services, unless you arrange something special with Google. Which appears to be Google Maps API Premier, an advanced service that uses a page-view-counter-based calculation to determine charges, and is not cheap. Which pretty much says you'd need to charge a subscription fee if you're going to charge at all. If you don't charge now and suddenly get hit with a bill from Google, your free app must remain free (according to Android Terms) so you're out of luck? I suppose it might be possible to include a Terms of Service with the application that says the user assumes all responsibility for any charges related to use of the Google APIs, but that doesn't seem likely to succeed. I think it would be difficult to manage. I also suppose that you could ask Google to block requests that use your API key until you can get a new version out with a fee attached.

Google also says they could charge for the use of the API in the future. This is stated specifically in the AJAX APIs doc, and indirectly in the Maps doc (Google can change the terms at any time). Since the API key that is used when calling APIs belongs to the Android developer, that tells me we could potentially be on the hook for Google charges. The Terms say that we can decide to stop using the APIs. Which is fairly easy when you're running a web site, much different when your application is deployed to thousands or millions of devices. Especially if you've distributed the application for free, and with an expiration date as required of later than October 22, 2033.

I'm nervous now about using Google APIs in Android apps and wondered if anyone else has thought about this. Should Google APIs be avoided? At least until developers have some legal protection?