Neat idea. This could be refined by adding a git hook that runs (rip)grep on the entire codebase and fails if anything is found upon commit may accomplish a similar result and stop the code from being committed entirely. Requires a bit more setup work on de developers end, though.

From the post of the account linked here (in Dutch): it is going to be a place for official government communication, not for individual government employees (and I presume, by extension, public registration in general)