lol, you got me looking into it. Ouch, things look bad. You can check on graphtreon, the site tracks subs and stuff. If you click "all" you can see it was on a decline until around Jan 21.
So the game had a healthy up push around Jan 2021. Updates around there included Office Party and Threesome scene. This pattern seemed to be able to hold itself until 7.8. I don't know what was release that created the exodus but around that patch the decline started and currently at his all time low. He was able to turn the decline around in the Jan 2021 update so nothing is set in stone. Thanks for pushing me to research that, I found it very interesting.
Although, now I'm curious on why everyone is leaving.

Maybe it's supply chain problems.