@BeautifulDoubt
And if I may, I will add to all what others are saying: that as a non-English speaking reader, I have already tried to follow a series but have unsubscribed because the level of concentration required to enjoy it while having to translate the text into my native language, was too high.
Yeah I'm pretty bad at English! 
Finally, all this to say that there are many factors that influence this kind of event. And like the others say, better not try to think about it too much.
All the more so, since this kind of behavior ... which I am not exempt from, is rather common to the social network in general. Clearly, as soon as there are likes, subscriptions and networking options on a website it works like this.