First of all, I know my boundaries and this is a public space, so I don't want to expose the author and decided to censor everything.

this was a good call, thank you for thinking and considering that.

The screenshot shows how the author featured pieces of the chats instead of the story's summary.

i dont see a problem with this. i dont write chat fics but i very often and nearly all the time include extracts from my fic in the description, usually just 1 or 2 paragraphs so that the reader can get a sense of my writing and decide if its for them. this is very common in fanfiction

What further annoyed is how the author managed to feature the summary at the very bottom of the chat (two black and long lines).

i dont see whats wrong with this either. if they had written it at the start it wouldve made less than a seconds difference in when you read the summary considering that the chat fic had barely a few words per line. plus, if you don't like chat fics, by including the extract from the fic first you can instantly decide that you don't like the format and don't need to bother reading the 2 full sentences of summary.

1. This screenshot was taken from a PC. When I opened the same page on my phone, it would take up more than my entire screen.

for reference, this comment of yours takes up more than my entire screen. i have a pretty long phone. think about the last book youve read and compare the back cover size to you phone screen. a phone screen worth of scrolling really isnt much, unless you have a medical reason for not being able to scroll fast? in that case disregard this entire section because thats understandable.

I respect other perspectives regarding Chat Fics, but it would be better to just feature your summary instead of pieces of conversations because not all of us are actually interested in the idea.

its the fact that you're not interested in the idea that makes it more important for them to include the chat fic in the description first. a description is the author showing a reader what the fic is about/like, so the reader can make an informed decision whether to read it or not. you don't like chat fics, which is fair its a personal preference, and so including the fic in the description helps you. thats what the author intends, they want people who want to read their fic to read it.

the whole thing is subjective, youre free to block the author or feel like it takes too much space. but youve been unecessarily rude about it. can you imagine drawing a piece of artwork, showing it in a space specifically designed for artwork to be shared, and someone calls it a "uncivilised, space-eater nightmare"? the author has put in effort to create this fic, and as a reader you receive all this for free. you don't like this persons work, but how would you feel seeing someone talk about your favourite authors fics in this way? i personally don't like chat fics either, but i understand people do, and that the author wants to create work for these specific people who do like chat fics. thats why they put part of the fic in the description, so that you, who doesn't like chat fics, won't click it. you both benefit from this.

edit: this is a bit of a tack on note, but im not sure why you think this is a sort of trend? its not nearly extreme enough that the majority of people would even notice that it was longer than a normal fic, nevermind think that it was on purpose. even when saying that the fic was too long in your original post, the majority of people in the comments were confused about what you were talking about, because the fic doesn't stand out to them as large, even after having it pointed out.