This is awesome and if it's legal I'd love to do similar things on geospatial projects I work on. However I don't think Apple will be OK with this use of their data. I know that Google closely limits its 3D tiles data through a specific API and Apple does not make a 3d API available, therefore this has to be against ToS.

From the ToS linked from OP site:

> 1.3 Restrictions. You will not and will not permit or authorize a third party to: (...) (xiv) decompile, decrypt, reverse engineer, attempt to derive the source code of or disassemble the Service or any portion thereof (except as and only to the extent this restriction is prohibited by applicable law or by licensing terms governing the use of any FOSS components that may be included with the Service)

I would love for people to prove me wrong that Apple will embrace this use of their geospatial data!