Fly.io is turned into a link by the forum software. Every “fly.io” in a post, each time someone mentions Fly.io by the name you use in the documentation: Fly.io.
Also, Discourse shows a helpful hint telling me somebody else has already mentioned a link to fly.io in a previous reply in a thread. Which covers the preview, preventing me from seeing if all my mentions of Fly.io homepage are properly linked to http(no s BTW)://fly.io/.
I know it looks like a link, and it is a domain, but every mention of Fly.io on the forum being bright blue seems a bit over the top. It’s not linkified everywhere in the docs