[jph]

MIT and BSD et al. required the compliance team to track code, attribute it, audit it, and ensure that if the code ended up in the company's external products, then the company could prove the code was always correctly handled

This necessarily included all updates to the code, subsequent patches by external contributors that come downstream, subsequent patches by internal contributors that go upstream, eventual sunset of the code, etc.

GPL was akin to a bright highlighter stating "internal use only".