[bux93]

It's not typically a problem that usage is event driven. At least not for prepaid phone plans. Or debit cards. Or mailboxes. Or any myriad of prepaid or quota'd services. It's not rocket science, just a bad business practice on the part of Google.

[orf]

Can you not see any relevant difference between an entire cloud platforms worth of APIs and… a prepaid phone plan?

[bux93]

You're right, telecoms billing - even prepaid - is much, much more complicated.