Main usage is for manual and automatic tests when a 3rd party requires a redirect url.
The goal is to get a decent, quick & readable (and parseable) result in a lightweight webpage.
Visit any https://test-result.dev/whatever page to get a "whatever" message diplayed. Yes this is dynamic!
No needs to check the URL, the message should be big enough.
If you need to display extra informations, pass them as "msg" querystring, for example https://test-result.dev/pending?msg=wait%205%20minutes