The error rate is 100% on the service that allows you to create PRs in the web site. Actual remote git service is working just fine. I might try the API to make a PR, see if that's working.

Update: yes that worked. gh CLI using the API was able to make a PR while the web interface was inoperable.

Second update: defeat from the jaws of victory -- the page that displays open PRs is also down.

Third update: CI isn't working anyway, so the CLI PR creation workaround doesn't achieve much.