I disagree, sometimes presence of something (even if free) can add more work for someone else. For example imagine that you maintain a popular application, you

I disagree, sometimes presence of something (even if free) can add more work for someone else. For example imagine that you maintain a popular application, you start receiving issues that your application doesn't work with musl. You try to fix it, but musl doesn't provide a reliable way to detect itself. You try to submit a patch but it is rejected. You absolutely have right to complain, lack of musl would prevent you from wasting time on making your application work with it.