bountyhive is not closed but its hard to see a new project or bounty on bountyhive i think its bcos of the bad result of ico and most of project not need bounty manager and such they only need IEO nowdays so bounty site like bountyhive will be dead soon sadly
I second your observation I knew it will come to this, these bounty platforms were set up in the heydays of ICO but now that there are fewer and fewer ICO and IEO they have no usage now, I'm afraid that they will soon close shop unless new legit projects will come out and get their service.
I have an account on Bounty hunters and some bounty platforms and the projects are very scarce in fact I seldom login on my dashboards anymore.