Since the "Used by" is some kind of horrible marquee something, I can't readily tell but it looks like your own Discord is not among the used-by list. Is that true?
For the weekly changefreq on Discord server url, are you arguing that's too frequent or too infrequent? On the server page, it has recently indexed questions so part of the reasoning behind that being weekly is to capture those recently indexed questions https://www.answeroverflow.com/c/143867839282020352
Archived threads get a change freq of monthly since they don't change that often and active threads have a changfreq of daily as there is lots of activity going on in them