Earlier quoted context omitted.
If you think they're "very clearly laid out", can you quote the relevant sections, and definitions, from the terms that make it so? I've been searching, and asking, and not seen them yet.
https://apple.stackexchange.com/a/193060 The terms are very clear. Apple wants to control distribution of apps, the enterprise program is only supposed to be for employees or for end users using under the direct personal supervision of an employee as part of an in office test. The conditions are clearly defined.
Given that the users of the app in question were being paid by Google, one could argue they are employed... or at least are contractors.
On the other hand, given the users did not have the rights generally associated with being an employee or a contractor... and they were not even getting minimum wage...
But at that point IANAL and courts would need to decide