Or better yet, use cloudflare tunnels and setup an actual permanent tunnel with custom subdomain support. If you want it to be a temporary one, it supports that too. For FREE.

Is that part of Cloudflare Teams? No offense to Cloudflare, but their pricing is really unclear. I have an account and I use them for a lot, but they have 3 different "plans" and then they have various ad-hoc products. Tunnel just says "view in dashboard." [0] If I click on that link while logged in, I'm taken to my dashboard with no indication of how to use Tunnel or anything. The plans page [1] indicates that it's part of argo smart routing. If I click on "activate argo" it actually does the exact same thing as the teams "view in dashboard" button -- it redirects me to the dashboard and has no indication of being activated or anything. Really frustrating.

[0]: https://www.cloudflare.com/products/tunnel/

[1]: https://www.cloudflare.com/plans/

It's confusing for me too

product page says it requires paid Argo (smart routing) subscription https://www.cloudflare.com/en-gb/products/tunnel/

the blog page says its free https://blog.cloudflare.com/tunnel-for-everyone/

and actually you can install and run it quite easily

   brew uninstall cloudflare/cloudflare/cloudflared
   cloudflared login
   cloudflared tunnel

this will launch a tunnel with a random subdomain listening to http://localhost:8080

It became free recently, so they've probably just forgotten to update their documentation which seems to be a pattern with CF.