in 2018, Facebook told Vox that it doesn’t use private messages for ad targeting. But a few months later, The New York Times, citing “hundreds of pages of Facebook documents,” reported that Facebook “gave Netflix and Spotify the ability to read Facebook users’ private messages.”
Surprising? No. Appalling? Yes.
Treat Discord like a public forum and you will reap its benefits with minimal negative consequences. Keep personal comms to a minimum there, be aware of what you type, and make trusted people hop onto Matrix/Element. It is simple.