For anyone else who still feels like this is "too good to be true", here's a quick video clip I made of extracting a piece of Manhatten as glTF files and rendering them in ThreeJS (https://threejs.org/editor/)
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.
https://twitter.com/Omar4ur/status/1656841042279137282