In my personal experience, I've been submitting proposals for a couple of weeks now and I've never received an answer from the client. I don't know if the job is still open if they hired another freelancer, nothing. It'd be good, since we take a lot of time in applying personally to every vacancy, to know what happens with the job and/or receive an answer, otherwise, it is a waste of time. I think to be encouraged by the platform to use it, we should see results. If we apply for jobs and never get one, or the client never hires, freelancers will leave the platform and it's a pity because it's a valuable idea.