In the final season of Silicon Valley, Hooli ex–CEO Gavin Belson announces “tethics”, a portmanteau of “tech ethics” and a pledge companies can sign to show they uphold the principles thereof. The idea catches on, and it becomes deeply unpopular for a company to not be “tethical”. Pied Piper founder Richard Hendricks is the lone holdout, objecting that signing the pledge doesn’t actually mean anything.
The joke is that Silicon Valley has spent the entire series portraying Gavin Belson as the most flagrant example of an unethical tech CEO. Like so much of the show, it’s a sharp critique of the real tech industry.