Giving your employer the standard two weeks notice is so if they're called by a place you'd like to work for reference they say they'd rehire you. If you go negative anytime during the exit process your management can use that to flip your re-hire status. That's just one way previous employers can affect someone who's left. The balance of power is firmly stacked against the employee and for the employer.

If you want to be a "voice of change" then you'd better have enough evidence to stand up in a court. Anything less can be gaslit.

Rare, but companies can shit on you if they ever get called during a background check.

e.g., * "Hi, I'm calling about Alice. Can you confirm Alice's title and start and end dates of her position?" * Started X, left Y. They're not allowed on the premises anymore."

Generally, companies avoid this because it exposes them to lawsuits, but all it takes is one HR rep who doesn't know the company policy.