That Noah fired some people who may or may not have deserved it. Happens every day. Anyone on HN who builds a company of any size will probably have employees mad at them for doing the same.
Employment is a MARKET. Both parties are "at will"...
If an employee quits without a good reason, is that scummy?
Should the scumminess of it depend on how it "affects" the COMPANY?
People quit every day to earn 10% more across the street, work with better technology, walk away from technical debt, shorten their commute, get away from a dreary office or smelly coworkers. Whatever.
There's no morality in it, good or bad. And employers should feel free to fire people who aren't fitting and/or cannot be kept for whatever reason.
As far as I can tell, that's the AppSumo situation. If you want to call that "scummy" feel free, but I don't see any logic in it.
That said, I learned early on in my career that you can't make mistakes or have bad optics with people's comp. There's no way to recover from a mistake like that, and people do not give you the benefit of the doubt.