There’s the philosophical intent of the FSF and then there’s what individual project authors intended by adopting GPL.

I think OP correctly explains the perspective of some/many/or even most authors.

Arguably, given the decline of GPL as the de facto license for OSS might indicate this viewpoint is at least an accurate perspective today and may have been the underlying truth all along. Certainly growing up I think I cared more about the concept of contributing improvements back than necessarily being able to have source to all derivative products and didn’t trust corporations to give back (I still don’t, but the situation doesn’t seem quite so serious for most projects).