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Discord Users Are Being Tracked Through Data-Scraping Site
(www.theregister.com)
This is a most excellent place for technology news and articles.
It says public messages are scraped in the article, but doesn't mention anything about private ones either way so it seems at the very least, PMs are harder to get.
Yeah, they are just slapping a bot in public servers and scraping all public facing data such as profile data and chat messages. Still, no reason for PMs to be plain-text in general, but hey, that's Discord!