A spy site is scraping users' Discord messages and activity across servers and selling them to anyone with $5:

https://www.404media.co/a-spy-site-is-scraping-discord-and-selling-users-messages/

A Spy Site Is Scraping Discord and Selling Users’ Messages

404 Media tested the service, called Spy Pet, and verified it is collecting information on Discord users, including the messages they post across usually disparate servers.

404 Media
@404mediaco Anyone with enough motivation can do the same thing with ANY chat platform, it doesnt really matter, as long as the channels are public to access, one bot can stay in there can save all the chat data etc. Unfortunately I don't think you can do much about this other than reporting bad bots and malicious actors violating privacy laws on purpose.