Arteta aims to create a cult-like atmosphere and normalise crossing boundaries, create intimacy rapidly. Lots of stuff that's very dicey at work or a red flag if you're dating.
Even more normal things like those Colney induction sessions where the squad sits around and ultra-mildly clap-hazes the new pledge like they're all playing a parlour game on the bridge of a spaceship.
I'm curious to know where he gets his ideas from, stuff like the hired pickpocket thing. Bet there's some Gladwell level management manual that's behind it. He seems to want the players constantly ping-ponging between vigilance and stimulation.