Copyright stems from a protective mindset, one that believes the creator owns the work, and must protect that ownership in order to profit from said work. The creator will share the work with others, but only at a price, and anyone who takes without paying, or uses it as a basis for further creations, is stealing.
That’s the copyright mindset.
The un-copyright mindset is that of someone who gives without any guarantee of profit, who lets go of ownership and believes the world owns the creation. I hope to contribute to the world in a small way, and if others benefit from this contribution, that’s a good thing. And if others use this contribution to create something new and beautiful, that’s a wonderful thing.
The uncopyright creator lets go of ownership, because to hold on to ownership hurts the world, and to try to protect that ownership leads to unnecessary stress.
I also eschew ownership, at least to some degree, and believe owning things doesn’t make me happy. Doing things makes me happy. Helping others makes me happy. Creating makes me happy.
It is from this place that I embrace un-copyright, and in doing so give to the world and hope that the world will be better for it, at least in a tiny measure.