A close friend of mine was recently -- as in a week or two ago -- recruited by Amazon. The process did not get as far as an offer, because the hiring manager told my friend that the expected hours would be around 80 per week on average. This was a non-starter for my friend, so the process concluded. (At least the hiring manager was honest up-front, and understanding when my friend said this would not be possible.)

Based on this, I think we can conclude two things. First, a lot of current Amazonians are unaware of other teams working insane hours, and second, those other teams are apparently doing so anyway.