DI, 'fair usage' is a hard to define term in copyright. What amount constitutes fair is not defined: 50 words from a novel could have a different weighting to 20 words from a song lyric, for instance, even if both were used in, say, a review. I have an academic book that’s in pre-print and I needed to get written permissions for any aggregated quotes from sources of over 100 words (two of my main sources were the Indo and Irish Times). I wasn’t charged for these and other printed sources (I was for photographs by the National Library) as it’s a small print-run and won’t make me any money, despite an eye-watering cover price! But this site is commercial rather than educational, and permissions or fees could be expected for excessive direct quoting.
Maybe a simpler rule of thumb is that a link and summary is a greater courtesy to everybody else than scrolling through acres of pages, and your quoted posts have gotten very long lately. I'm not having a pop at you, you're usually one of the more considered posters here, but others have posted equally overlong quotes recently.
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