I recall, but not where, some highly upvoted, accepted answers somewhere that merely quoted text from a website, save one or two sentences sourcing the quote.
I ask as this answer (where I quoted a Reddit comment) was unilaterally deleted on grounds of "plagiarism".
In a sense - you're asking why the question was deleted.
Are there highly upvoted, accepted answers that quote just a website? is probable. Our standards have evolved to be stricter over time.
That said - just copying large chunks off a website is literally the definition of plagiarism. In theory I could literally replicate the relevant FAQ page
or I could quote the relevant parts
Do not copy the complete text of external sources; instead, use their words and ideas to support your own. And always give proper credit to the author and site where you found the text, including a direct link to it.
and suggest that citing your sources is necessary but not sufficient. Your answer should at the very least paraphrase the information or better yet be a synthesis of various sources and your own ideas.
So no, by right a selected and highly upvoted answer shouldn't largely consist of quotes from external sources, even appropriately cited
