Why is the default uncapped then other than the hopes of billing people who screw up or get exploited.
My point is either choice, caps or no caps, has its cons.
No, you don't really have to give Google a bunch of phone numbers. The input box will also accept entry of the following text:
“I'm a big stupid idiot, and when my API stops working, which it will, it will be all my fault and not Google's.”