What I like about this is how effective filter it is. Whilst it is easy enough to do with any online service, addon or even the web browser, it bars the clueless trolls who claim themselves to be programmers but don't have a clue about even the basics of REST.
I used their API to apply for a Frontend Engineer position a couple months ago. It works! They got back to me via email but never responded past that initial contact... perhaps they got busy and forgot. I'll send them another message!