Simply having an account there normalizes having personal conversations that can be easily data mined for AI, or otherwise used by Discord or their database/systems administrators. Section 702 of the FISA Amendments Act (FAA702) allows the federal police to access all of same without a warrant.
The crypto frontrunning possibilities alone must be worth dozens of millions per day.
Friends don't encourage friends to use non-e2ee chat systems. Don't be the honey in the trap.