Well, not

Those invariant section indeed make that license non-free.

Again, beyond the availability of freebies that those rich artists were kind enough to
release, what did we actually gain here?

Will you be able to mix that and use it in a party you throw? Will you be able to use that in
your new movie? (probably not, because you put it for download in a page that has adds, and
thus it is for-profit even if it freely-downloadable)