Emil is just dick swinging to tell people that Bethesda own Fallout and they/he can do what ever they want. Nothing new in that, however it's funny that this time it seems his dick got caught in the shit fan.
If the BOS was a Tribalish faction then they would more similair to the Reaver Movement or the Ciphers.
https://fallout.fandom.com/wiki/Reaver_Movement
https://fallout.fandom.com/wiki/Ciphers