Charles left due to money issues. Like most businesses on the internet, The DIS decides pay primarily through rap battles. The sluggish speed of his improvised insults and a complete inability to rhyme led him to a life of poverty. So he left to hunt down a secret cache of Spanish gold in the Caribbean. Hasn’t found it yet. This piracy stuff turned out to be way more complicated than he expected. He can't even name all the sails yet, and Don’t get me started on his knots...
PS: none of the above is even remotely true, but was written by Charles himself over in the twittersphere.
I get that people miss some of the old hosts, but it does often sound like the endless “where’s Charles / Oliver / JL / Steve” sometimes starts to sound a bit like “why can’t these people not move on with their lives, so that I can watch them on YouTube every week”. God help us if Craig or Ryno leave.