You have to remember that there is something called "bounce effect" when it comes to marketing and drawing out stats from numbers.
The bounce effect is a term used with a % marking to see how well your project is doing in terms of hooking people and in this case it starts already from the presentation (aka your cover/blurb on the front before reading).
If we look at the requirements set by webtoon you can't fully argue against it until you know how they run their business model. You can say that it sucks like hell, but that's about it.
The core fact is that your viewer count can be extremely high depending on trends, your personal marketing strats and presentation within your respected genre, some things work better than others. So, if your sub count is solid it confirms that your story has the ability to retain an audience which is incredibly good, but as the views stays stagnant around the same count as your subs you might have to do some research on how to market your project better or maybe even change up your cover and blurb to make it more attention grabbing (this is not easy and takes a lot of devoted time to research before you get an understanding of your projects best selling points).
I don't know if any of this is of help to you or if I have just completely missed the point of your post (if you already know this and just wanted to rant then please just overlook my silly interference). I do wish you all the best on your journey~ 