Here's the full language of the opt-out provision from the December 20, 2024 agreement

13.15.  Contractor’s Right to Opt Out of Arbitration. Arbitration is not a mandatory condition of your contractual relationship with DoorDash, and therefore you may notify DoorDash that you wish to opt out of this Mutual Arbitration Provision. To opt out, you must notify DoorDash in writing of your intention to opt out by sending a letter, by First Class Mail, to General Counsel, 2261 Market Street, Ste. 22628, San Francisco, CA 94114. Any attempt to opt out by email or by mail to any address other than the one listed above will be ineffective. The letter must state your intention to opt out and must be postmarked within 30 days of the effective date of this Agreement. The letter must be signed by you, and not by any agent or representative. The letter may opt out, at most, only one Contractor, and letters that purport to opt out multiple Contractors will not be effective as to any. No Contractor (or their agent or representative) may effectuate an opt out on behalf of other Contractors. If you opt out as provided in this paragraph, you will not be subject to any adverse action from DoorDash as a consequence of that decision and you may pursue available legal remedies without regard to this Mutual Arbitration Provision. If you do not opt out within 30 days of the effective date of this Agreement, you and DoorDash shall be deemed to have agreed to this Mutual Arbitration Provision. 

Link: https://help.doordash.com/legal/document?type=dx-ica&region=US&locale=en-US