If inventor A invents something useful and foundational and open-sources it because he feels it benefits all mankind, can some greedy turd patent it later and yank it back out of the public domain because he was "first to file"?
Currently all I have to do is invent the thing and publish it and it becomes prior art, no need to file anything because I'm first to invent and I proved it by publishing. Under this new system do I have to file first and pay for it before I can declare it public domain?