While the FAA does not have jurisdiction over indoor space, there may be local laws that apply.
The company doing the hiring may have commercial drone insurance that only covers pilots with their Part 107.
They could also be making the...
using your phone as a "hotspot" maybe and other networks around you would be a more likely explanation.
I used to stream music on an Iphone in my shirt pocket while flying,, I got a noticeable lag and stopped streaming while in flight..might be...
Helicopters are allowed below 500ft for reasons as trivial as sight seeing tours.
However, they are far more maneuverable, with the ability to hover in place. This makes a critical difference, and is largely why the rules allow it.