More accurate to say you don't know what the feature is and the verbiage is confusing.
"Fenix features the ability to share local sites immediately, securely, and temporarily. With one click, SSH tunneling will proxy your local server to a privately assigned (HTTPS) URL. There’s even a copy link that can be sent to collaborators. Presto! Your laptop is now a public web server. Possibly even a few if you share multiple sites at once."[1]
I guess they are providing the reverse tunneling as a service?
"Fenix features the ability to share local sites immediately, securely, and temporarily. With one click, SSH tunneling will proxy your local server to a privately assigned (HTTPS) URL. There’s even a copy link that can be sent to collaborators. Presto! Your laptop is now a public web server. Possibly even a few if you share multiple sites at once."[1]
I guess they are providing the reverse tunneling as a service?
1. https://medium.com/tech-recipes/love-localhost-f488940f3e38