I maintain a huge number of git mirror of git repositories and i have some overview of activity there. Many open source projects have stopped activity and/or do not make any new releases. Like syslinux, which seems to be in a similar situation as unzip. And some projects like Quagga went completely awol and don't even have a functional git remote.
So unzip is not really that special, its a mode general problem with waning interest.
So unzip is not really that special, its a mode general problem with waning interest.