Facebook is absolutely well-known for its terrible work-life balance, borne out of high expectations and a high percentage of overachievers.

Apple may be worse than others.. but also know that people move around, and bring a part of their old culture to the new team. If they're in a senior position, and they have a bias towards people from their old employer while hiring, they could start hiring people from the ex-employer. Mix that in with a fast growing team, and now there is a risk of a subset of the company acting like they're at the old company.

FWIW, I have heard these types of stories before too, and they are definitely NOT unique to Apple.

No, this is a "specific team within FAANG" problem. It absolutely happens at some teams in all of them; it also absolutely does not happen in others. That's the problem with having very large companies; the experience is not homogenous.