I see they offer free cancellations and refunds for their two top-tier tickets, but can't find a reference for them offering it for all tickets. Do you have a link?

https://mobile.southwest.com/fare-information/

https://support.southwest.com/helpcenter/s/article/policy-ch...

Before, you could cancel within 24 hours of boarding and get your full amount as at least a credit without any extra fee for any ticket class. That credit had no expiration. Now, there's a fee and expiration for this credit.