That's a good point. However, I think for the entity to do that in practice, the entity would need to also own the trademark and the Github repo (or wherever d

That's a good point. However, I think for the entity to do that in practice, the entity would need to also own the trademark and the Github repo (or wherever development takes place). So there's no real risk to assigning copyright to the FSF if the FSF doesn't also own the trademark and the Github repo.