For the same reason that there aren't any community support moderators or admins.

The time it would take for a Square Employee to train a random on the policies, what you can and can't do, how to handle certain situations, when to investigate, when to track, when to temp ban, when to permanent ban players/accounts would cost the company more than they are willing to spend. You also have to remember that you gotta have a watchdog for the watchdog for the watchdog to make sure everyone is adhering to the guidelines in place (which also costs more money).

Personality also comes into play. They don't want someone in that position that will ban players because they don't like the other player(s) or are mentally unbalanced.

You also have to remember that the person in that position would have elevated settings and logins to Square's CRM/Data Centers/Account System (where credit card information is stored). It's unheard of that Square is planning to release an API for XIV, there is no way they would allow an outside source access to their back end system on top of their billing and payment matrix (that's a lawsuit waiting to happen).