This is the best thing to do for favorites, reviews, ratings, reading lists, Patreon, etc. It's like the whole "HEY GUYS DON'T FORGET TO SMASH THAT LIKE BUTTON, HIT THE BELL ICON, AND SUBSCRIBE" thing on YouTube. Is it annoying? Sure, to many people. But is it extremely effective and infinitely better than saying nothing at all? Abso-fucking-lutely.
Humans are simple creatures. This kind of thing just isn't on most people's minds most of the time. That's also why YouTubers tell people to do it right now because, if you tell them to wait until the end of the video to do it, they're probably going to forget. So, authors should be shameless and annoyingly remind their readers to do all of that seeing as how the vast majority of them simply just won't even think of it in the first place no matter how much they might love your story or chapter.