This is common knowledge. There's a lot of threads talking about the fakery going on on Line, even here on these forums. and lot of authors that witnessed the very poor engagement they get, sometimes as less as 2 to 3% engagement, (and actually less than 1% on the supposedly most popular series ) botted views from the site itself, it's the same principle as a lot of other website doing the same unfortunately, there are serious studies showing internet traffic is for 75 to 80% driven by bots used by big companies to attract real people / users.
when i realised how fake their algorithm is i removed my comics from there. My guess is when you get featured you get even more of that algorithm and % of compensation in botted views and subs in proportion of real people actually subbing. That's just the industry for you. It doesn't take a rocket scientist to figure it out.
I Wish i could remove my comics from the fakery that is Steemit too, they use the same kind of methods, but it's blockchain based so, yeah, that's sad.
Edit : Maybe also because i already worked as a webmaster for a number of web service companies that are using these tools and server farms / bot farms to also trick their customers into thinking their solution works way better than it looks, it's all about faking numbers so you catch a number of real persons in the batch, but you usually sign nda while you work for these companies to not talk about it.