I had an interesting email today saying that developers at the writer’s company wanted to use one of my packages, but weren’t allowed because it was under an unlimited license.
I release quite a few of my packages under an unlimited licence, at least for toy projects and immature packages. In those cases, letting users do what they want is more important to me than the fairness of, for example, the GPL.
assertive is a notable exception, because it’s taken a lot of work, and also because it contains some RStudio code.)
Anyway, the lady who wrote to me requested that I release my package under a dual license to enable her staff to use it.
My alternate solution is more elegant: since the license is unlimited, you can simply download the package source, edit the DESCRIPTION file to change the license to whatever you want, and use it as you see fit.