It is "too good to be true", they don't allow for it: >Applications using the Map Tiles API are bound by the terms of your Agreement with Google. Subject to th

It is "too good to be true", they don't allow for it: >Applications using the Map Tiles API are bound by the terms of your Agreement with Google. Subject to the terms of your Agreement, you must not pre-fetch, index, store, or cache any Content except under the limited conditions stated in the terms.