If you're talking hacker vs cracker, linux vs GNU/linux, then sure, its mostly a waste of air.
As far as "open source" goes, its in essence a brand of a cultural movement. And like real brands, some unscrupulous people want to enrich themselves off the brand by making a substandard product but pretending its the real thing. This is harmful to users who are swindled and it is harmful to open source devs whose reputation are stained by association. (To make the metaphor concrete, an example of a swindle would be someone makes open source software which isnt really, then sues all its users that use it in an open source fashion. This hurts the users, but also hurts people who make open source software because people cant trust the brand anymore)
