Well, if they want no one to use their libraries, then fine. You would think that as a person publishing library code to a public registry, you would be incentivized to ensure your code is broadly usable. At least in general.

I know this is in the context of JSR where this isn't an issue, but I suppose some people just want to just use a registry as a personal code repository. Id just hope they don't pollute the top level namespace in that case.

Who am I kidding, sadly for NPM that ship sailed years ago :*-(