I am sure there is one as the project looks very well done and comprehensive, but I'm sorry, I don't quite understand the use case for this? Where would one use this instead of SSH or even SSH over a http proxy?
Contributor here! (Only one PR but still!) At Automattic we use GoTTY to allow customers to run subcommands of the WordPress CLI on their web container in their browser. Having them connect via SSH would have been much harder due to things like keys and routing. With GoTTY we can use our existing web-based auth and routing systems. The support burden is extremely low compared to ssh.
Seems useful for helping a colleague on troubleshooting cli related tasks?
Web browsers are available on practically every PC but SSH clients less so (especially on older Windows, I think Windows 10 has one now but still). This seems like a great way to check in on long running tasks from wherever you are (e.g. on a mobile phone or hotel computer), and being able to disable input means you don't have to worry too much about someone finding the URL and running malicious commands.
This is perfect for integrating into a web app behind a proxy that adds authentication, SSL, etc. Put it on a small cloud instance, add your favorite text editor, install all your development CLI tools and you've got a completely productive and 100% mobile development environment for example. You could load it up on a tablet while lounging in the sun and get real work done.
Until something breaks and you need to SSH into the server from your tablet which you can do anyhow.
I've been using it for a few months to host a few terminal based games, and for that it has worked very well. I can also imagine it being useful for quickly throwing up a status page using top or whatever other tool you want.