Earlier quoted context omitted.
This, at least subreddits are relatively stable, public and searchable. There is so much knowledge hidden inside huge chat logs of semi-public Discord servers which might disappear at any minute and is hard to retrieve, unless that server maintains a wiki or something similiar.
So then someone should make a basic product/feature that let's you "save" (encapsulate, and then push) a conversation to a public page. Let's say I run a Discord community around some product/service, like a rendering engine like Octane. Two users have a meaningful conversation explaining how to increase light samples. Let's say that information is not documented online. There should be a nice way to summarize + post…
it's not impossible. And ultimately many discord groups will try to have channels dedicated to keeping a list of guides (usually some google sheets maintained stuff) that are slightly more publicly visible. But it still comes down to the will of the people to maintain that and make is accessible.
Main barrier with your approach is that I'm not sure how scrapable discord is. It (to my knowledge) never had an API that did more than let you automate posting and maybe scan recent comments to reply to.