You have until May 15. The announcement just went out today; if they tried to make it retroactive, it wouldn’t hold up in court.

Opt-out. You can decline this agreement to arbitrate by emailing an opt-out notice to arbitration-opt-out@discord.com within 30 days of April 15, 2024 or when you first register your Discord account, whichever is later; otherwise, you shall be bound to arbitrate disputes in accordance with the terms of these paragraphs. If you opt out of these arbitration provisions, Discord also will not be bound by them.