>>118572I highlighted those three things due to the following reasons:
• The fact that a poster is uploading webp (as opposed to jpg or png) says something about the poster (he's probably very young, for one thing), especially when that behavior (being fine with webp and uploading it) is combined with the context here
• Likewise the pic containing a loli/child/underaged character says something about the poster as well, and also obviously such a character being featured prominently in the official artwork for the anime says something about the anime - thus it should be noted
• Providing THE YEAR the anime was made/aired tells the reader A LOT of what he needs to know about the anime - "2010" for example (as that's well into the nuanime/tranime era of anime) indicates the anime is almost certainly coal
Three red flags, in other words.
Readers can disregard the webp point if they don't think that indicates anything, but point 2 and 3 together is valuable info about the anime - in this case info letting you know the anime is probably extremely far away from being "one of the best anime of all time" as OP called it.