

Why do they not care?
Because, for many of them, they don’t have any reason to. In other words, privilege. Copyleft licensing is a subversive, anti-establishment thing, and software engineers are predominantly people who benefit from the established power structures. Middle/upper class white men (I’m included in that category, by the way). There’s basically no pressure for them to rock the boat.
And why would they avoid GPL
Because many of them are “libertarian” ideologues who have a myopic focus on negative liberty (as opposed to the positive variety).
Yeah, but you and I aren’t really representative of all software people. Most of them just want to grill.