And the points listed seemed to be about maintaining productive working relationships among colleagues - not ethics.

Funny choice of topic for an ethics page.

I don't think that's a fair assessment (I'm not affiliated with YC in any way). I think that:

> Not using misleading, illegal or dishonest sales tactics.

> Keeping your word...

and:

> Generally behaving in a professional and upstanding way.

cover more ground than you imply. While it might not hurt for them to take a few more stands (e.g., "ensure the integrity of customer data", "don't be a net drain on public resources"), I think it would be a bit difficult to add a lot more ethical requirements without getting overly industry-specific and excessively lengthy.