Because (A) it's a usable interface accessible by pretty much anyone [with a phone number, as of recent] (B) it's cheap as you don't pay for bandwidth and sto

Because (A) it's a usable interface accessible by pretty much anyone [with a phone number, as of recent] (B) it's cheap as you don't pay for bandwidth and storage is either $0 for 15GB or paid storage at a low-priced rate[0] (C) all of that storage is geo-redundant and thus extremely unlikely to ever be lost, outside of Google terminating accounts (which isn't part of a lot of people's risk models). 0: https://one.google.com/about/plans https://one.google.com/about/plans