Have you read Stallman’s essays on the topic? If you’re interested in this stuff, he goes very in depth on the goals of the free software movement: https://www.gnu.org/doc/fsfs3-hardcover.pdf The GPL was created explicitly to advance those goals.
From Wikipedia’s summary of the essays:
The author proposes Free software licenses (mostly GPL) as a solution to social issues created by proprietary software and described in essays.
https://en.wikipedia.org/wiki/Free_Software,_Free_Society