Authentic Jobs is one of the more old school places that heavily catered to web design type work. A more accurate assessment of this data may be that web design work is drying up, but we've known that for a while. It's hard to say since they don't mention the competitors they are tracking, but they may serve the same shrinking market as well.
I've seen a drastic drop off of jobs on Angel List. In 2013 there were roughly 10,000+ remote jobs available in the US. Today it's down to hundreds. I'd be interested in a full scale research effort.
