Unless you have a case so egregious there is a high likelihood of punitive damages or a class action, no labor attorney is going to take a typical non union individual’s case. 30% of the actual damages alone aren’t even close to being enough to get an attorney to take a case that will take years to resolve and will cap out with a low 5 figures payout for the attorney.

Depends on the HR department. If you can communicate why "bad for employees" is bad for the company, then they'll help. Same with the legal department. And yeah, sometimes lawyering up is necessary to demonstrate that bad for employee is about to be bad for company.

I don't see it as a hostile work environment at all. People can message me whenever is convenient for them and I'll read and respond whenever it's convenient for me.

I work with people from different time zones and people who like to keep different schedules, some waking up very early or working very late, and I myself wake up pretty late. It just doesn't make sense that I should demand people message according to my schedule, but I'm also not going to wake up early or work late to match theirs.