There's another angle to many of these programs, which is you both give and receive a limited license to all existing content within the program. This makes them an even worse deal, because a) you actually lose your own republishing and removal rights, and...
I was looking at a "Community Content" program on DriveThruRPG and it provoked some thoughts on copyright and licenses and who community content programs are for, because I don't think most of them are FOR third-party and homebrew publishers.