So it's basically GPLv3-or-later but with veto power of the "-or-later" part by the maintainer (but not the contributor). That's pretty clever. And, since you'r

So it's basically GPLv3-or-later but with veto power of the "-or-later" part by the maintainer (but not the contributor). That's pretty clever. And, since you're asking someone to maintain your contribution, it also seems pretty fair.