Ah, got it. Nah, you're right, it's obviously meant to be used from within apps, not manually sent to someone else. Just a late-night derp.
I didn't expect it to be a service for freely hosting data -- that's pretty cool. I assumed it would return a rate limit error if you tried to use it for anything substantial.
(I missed the About link https://jsonbin.io/about at the bottom, which explains all this.)