Ask HN: What's happened to Swivel?

Swivel.com were smart startup positioned themselves as YouTube for embeddable charts. They reported 1mln. charts in the system a few years ago, but last few months traffic to their web-site declined significantly and last 2 weeks the site is down at all. Anybody knows - what's happened to Swivel? My startup is somewhat similar to Swivel so I wonder whether the initial idea was bad or they faced some technical or organizational problems. Thanks.