I mentioned here recently that I released a personal project under the GPLv3. The very first issue someone filed in GitHub was to ask me to relicense it as something more business friendly. I don't think I've been so offended by an issue before. If I'm writing something for fun, I could not possibly be less interested in helping else someone monetize my work. They can play by Free Software rules, or they can write their own version for themselves and license it however they want. I don't owe them the freedom to make it un-Free.
The fact that this is hosted on a FSF-managed service indicates the author likely sees it similarly.
Of course, no one has expressed interest in doing that yet, so this is purely hypothetical.
And yet, this is a single-user labor of love by one person hosting it on FSF’s servers. I don't know them, and this is pure conjecture, but I suspect they probably couldn't care less if that made it challenging for commercial users. There are plenty of other Lisps for them to choose from.
https://common-lisp.net/implementations
I think a full-featured GPLv3 implementation would be very cool, personally.