Here is a list of things to remember:
Edgeapp URLS do not preview your project in the browser, but instead only work when sent additional info (your domain) which Glitch/Fly.io have in their systems as being tied to the project you added that domain too and therefore displaying that project on that domain. The reason going directly to an edgeapp URL won’t work is because that isn’t tied to a project. (Thanks @EddiesTech)
Don’t spam the forum- I understand some of you don’t know this yet but you must email email@example.com for removals. Just send them your project name and the domain and you should get a reply in about 24-48 hours
You should try to use cloudflare on domains as you get statistics and DDoS protection. However this is your decision.