This whole story is really sad, and a blow to the open source community.

The whole thing was brought to court in Texas : https://dockets.justia.com/docket/texas/txndce/4:2016cv00110/269823

Steven Jungels last words on this project : https://github.com/transcode-open/apt-cyg/blob/master/status.md

Interestingly, it was never even mentioned on the Cygwin mailing list:
https://sourceware.org/cgi-bin/search.cgi?cmd=Search!&fmt=long&form=extended&GroupBySite=no&m=all&ps=10&q=%22apt-cyg%22&sp=1&su=title&sy=1&type=&ul=/ml/%25&wf=2221&wm=wrd&s=DRP

Btw, I did not know that Cygwin was now founded by Red Hat.
There is a little bit of interesting history of the project on Wikipedia: https://en.wikipedia.org/wiki/Cygwin

Commits are still regularly made on the project:
https://cygwin.com/git/gitweb.cgi?p=newlib-cygwin.git