There is nothing cultish about the way Amazon interviews. If you are a good engineer with a relevant background who can speak english you will have no problem passing these interviews. I'm not sure why you are framing it as cultish.
In my experience, they also give the toughest programming questions. It is a lot of prep overall.
Now I work at one of the slightly more sane FANMAG (to include $ms) companies.
Pretty sure I dodged a bullet, maybe the engineering manager spared me because he liked me more than I realized.
Ones I'd never consider, even for a cushy VP role- FB, Goggle.
Ymmv.
Maybe the service teams are less heavy on LPs due to not being customer-facing?