Earlier quoted context omitted.
Looks like it just downloads/uploads plain data to the web service. I thought that in this age of internet technologies a web site would be enough.
What about curl, wget, httpie? Or how about lynx or w3m? Plenty of people want to utilize CLIs and it's definitely beneficial when learning to program to get as much experience on a command line as possible.
We already have this great sandboxed environment called a browser for running untrusted code from the internet. They could still offer endpoints for curl, if it's just about using the command line.