> Is it just out of convenience that license headers are always kept
> GPLv3+?
Yes. But it's an important convenience; without it, some people could not
work efficiently with gnulib.
My recollection is that after discussions with rms and Brett, we
previously concluded that it would be better all around for the notices
in the files to reflect the actual license (LGPL), and for gnulib-tool
to adjust the license if needed (switch to GPL). And that this was
feasible because coreutils uses gnulib-tool now.
