Just adding, that, outside of Rowling, who I believe has a different contract than most authors due to the expanded Wizarding World and Pottermore, most authors themselves cannot quote their own novels online because that would be publishing part of the novel digitally and that’s a right they’ve sold to their publisher. The publisher usually ignores this as it creates hype for the work, but authors are careful not to abuse it.
Just saw a meme the other day about how the old mantra “Don’t feed the troll” seems to have fallen by the wayside and about 90% of the issues on the internet right now are caused by that.