Lots of developers and power users make a good chunk of Arc's use base. If you're after some interesting credentials then "every Arc user" is a perfect group with little noise.
If I had to guess, the typical Arc user is a Mac user in tech. It doesn't run on Linux, most windows users wouldn't run it, and non-tech people haven't heard of it.
Then most engineering IC people will most likely run Firefox or Chrome, so you're probably looking at designers/founders/managers as your target.
Probably some interesting targets there, but not the type that the NSA cares about. Just pure conjecture on my part of course ;).
