I was on the set for one of the productions, and I'll just say at the time I thought the experience was a one-off for one of the bigger productions they've put on. Since reading other people's stories, it seems more a case where the pressure to push, push, push for the next big video is a ginormous machine that grinds people pretty hard.
An early stage startup, with a few employees, pushing to hit some milestone, could survive like that a while. But you can only burn through so many creative minds driving them at 110% all day like that. IMO, you have to find a sustainable burn rate that might be too much for some, but isn't going to drive away everyone desiring normal family / outside work life balance, especially 5-10 years into an org's lifetime.
MrBeast (the org) has hundreds of employees and probably 5-10 major active productions (in pre-prod, prod, and post-prod). They've achieved a lot of impressive results, but they also get to cut a lot of corners traditional media (Hollywood, TV production) can't due to labor laws and unions.
Edit: Not to mention, the 'No does not mean no' section was a bit alarming. There are plenty of times when no most certainly means no, and you can really damage business and personal relationships if you can't figure those out.