Having that kind of power as an implementer requires the backing of a union.

And the utter certainty that you are infallible.

Depending on the company culture, this may not be allowed. As in: PMs will ask another dev to implement it; if this happens more often then they will replace you.

Also, searching for dignity in a post-“don’t be evil” startup environment seems unusual.

While I agree with your sentiment, I'll note that ethics are hard to hold when it's your livelihood on the line.

Expecting a shift in corporate culture to come from a short list of individuals making great personal sacrifice (of their careers, reputations, whatever) is not reasonable, sustainable, or realistic.

I know there are a lot of folks who abhor regulation in many contexts, but stuff like this is most effectively handled by such mechanisms.

And then what, be out out of a job because you were insubordinate? If you have the personal wealth and security to lose your job and possibly not have a new opportunity for the next year or so, then that's great. Not everyone has that security, and a roof over their head just may be more important than personal convictions about how to treat users.

what an emotional response to work

While I personally wish that there were more people who had the ability to make such decisions, and exercised that ability, I think that this is a hostile response to someone who didn't have to spend the time to come on HN and describe the situation to the best of their ability. Calling people undignified because they, or their company, isn't perfect is just going to close down channels of communication.