I believe that http://portsmon.freebsd.org/portsprsunmaintained.py would be a very useful tool for someone looking to adopt ports. Seems it's not fixed for some time already.
Erwin has not been active in the project for many years.
I am (still) aware that portsmon needs work.
Any way I can help? I speak decent Python and might have some free time.
*** This bug has been marked as a duplicate of bug 224603 ***