Comment by JohnMakin

This would indicate wherever they were hosting their site on no longer exists. 503's even on pages that should mostly be static suggest the backend no longer exists, or whatever ingress they're using in front of it disappeared. As far as I can tell every single page on their site is 503'ing.

Example of a response I see:

< x-cache: Error from cloudfront < via: 1.1 bdf85d6d4811ab08c57841855a848f8a.cloudfront.net (CloudFront) < x-amz-cf-pop: LAX54-P11 < x-amz-cf-id: nTQ-y1Ut3F-04jUCDM09ordCtj0CMkVmmtZTe__BtzEr1sMJu7rKaw== < age: 76773