I'm not saying that this is objectively wrong, but it's not always so clear-cut. E.g. supposing you're at Google, but you're working on the Go compiler or libraries. Does it mean that you are "involved in ad tech"? Kinda sorta, since what you do makes other Google employees more productive at writing ad tech. But there are millions of Go users outside the company using it for all kinds of things, so one can reasonably conclude that whatever benefit Google itself derives from their contribution to Go, it's dwarfed by the public benefit from the same.