From our research, devs aren't looking for another LinkedIn spam machine, so we're going to build something better than that. Our thought is that if we do that well, and we update users' resumes for them each year, then it will work out well. If we do that poorly, then we can't update users' resumes annually, and it won't work.
But it is free, no hidden cost, no hidden spam. And if we aren't adding value to your career, then it's easy for you to simply opt out permanently.