[Folcon]

You're basically describing the Random Model by Greg Stolze[0]

Basically someone creates a work and puts a price on it and then like with Kickstarter asks people to fund it, however after it's funded it becomes public and is released into the public domain

-[0]: unfortunately I can't find the original article, but this covers gist of it https://caffeineforge.com/2012/11/26/the-ransom-model/