> Promote the development of surveying and mapping in the service of national economic construction.

It was very transparently an economic and technical development policy from the start, it was never intended as a military policy to hinder enemy mapping ability.

They do similar information control across many other industries besides maps. The CCP is very good at gatekeeping access to foreign/uncensored information through a few state-owned enterprises, then metering it out as they see fit for economic progress.