You are partly right but only partly. Here is my point of view:
Koichi stoped accepting new members and payments on this site some time ago. I subscribed in 2015, so it happend later.
He dosen’t maintain neither this site nor EtoEto and doesn’t give explanation and promises to people for a few years now.
After a pause of three years I am working again with materials on this site but it’s already heavily outdated: anki files are difficult to import in newest versions of Anki, Lang-8 doesn’t accept new members and it is an important part of this course. Nevertheless I intend to finish it in parallel with Wanikani before passing to something else.
That’s why I won’t ask for refund. Moreover I had a nice discount on Wanikani for having subscription here.
And I don’t think Koichi is the self interested cheater you describe.