I know, right? I ranted about this in the past, but I decided to let sleeping dogs lie. You think he would realize that 5 people paying $1 is just as good as 1 person paying $5? Maybe even better in the long run too, since more people could be subbing longer!
A little search in the Koi Discord even as recently as yesterday will quickly tell you that Kplug has a negative reputation even with some of the most reputable members, and they even refuse to support getting it working.
Yet, Katarsys leaves a faulty free public version (lacking much needed practical features like releasing the head lock, I see people complain about that a lot) out there and (seemingly) refuses to re-enstate the $1 tier. He leaves it to the hapless user to deal with all incompatibilities, and it has so many issues with it that the Koi Help channel gave up even trying. It's his decision though, I gave up with Kplug a while ago.
Don't get me wrong though I think it's an amazing plugin, it's just very poorly maintained both with tier choices and user friendliness. He is probably a rookie (we all are once) at business in general (although obviously a stellar programmer), and will most likely improve in the future with more constructive feedback.