People are too cagey in general.
One of my pet grumbles is that when I try to contact people who have licensed NC or ND,
and who theoretically understand why CC licenses exist, I often even then cannot get a response.
I think that one solution is to just license as much of one’s own work BY as possible, and to
liberally grant permissions when possible. The weight of samples created if only 10,000 people acted in this way would remove the worst shackles of permission culture from creativity.