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My guess is it’s because it’s a similar role to a Reddit Admin, which is to say they’re basically a global moderator. Also, having access of any kind to the site’s SQL server requires an element of trust. That’s probably why they require the video interview.
People can usually unlock the carrier on their own. Many phones (or at least every phone I’ve ever gotten from T-Mobile) even come pre-installed with a carrier unlocking app. It’s just not automatic, and certain conditions need to be met.
People may also sometimes be able to buy phones already unlocked directly from the manufacturer if they want to. (Whether or not they’re able to do this depends on the manufacturer.)