If someone is working 100 hours a week, that means they're doing everything else - eating, sleeping, seeing family, commuting to work - in that other 68 hours.
Think about what that means. If you sleep 4 hours a day, that's 28 of those hours gone.
Okay. I've decided to believe that this is totally voluntary and not done out of fear of losing their jobs/place in the industry, especially considering how hard it would be to get work at that level again.
It's still terrible for them.
But just because you love something doesn't make this okay.