Well i guess people have moved on to a better and more advanced alternatives in the likes of uniswap, 1inch, etherdelta was a pain to begin with, it was the reason i never liked dex, because back then the interface was to shabby for me, nobody uses them again so what do you expect! and it doesn't seem as if the devs wants to keep the place running, it looks deserted.
We have the same story. I really hate dealing with a DEX platform before because it was so difficult for me, not so user-friendly and there was even one time that I lost a token worth $100 in a DEX all because I was so confused back then. No wonder that when better and more user-friendly DEX platforms came in, the market shifted. Of course, who would not want to let go of those old and crazy DEX when the new ones are much better?