This will be the last time I speak about this subject, but to put it bluntly: no, I do not not know why they left or where they are. (This is not only directed at you, anon, I apologize for using your message as the catalyst)
As far as I am aware, it has been about a year since they have been gone? It's time to let people go.
Many names I do not know in the ut fandom, new and old, and I am just not the beholder of all knowledge on these things. Yet this seems to be a recurring theme of inbox messages I get.
"Do you know where x went?"
"Do you know about/who x is and their x?"
(Please spare me! I dont know how to answer these messages over and over again ^^;;)
I realise that you probably love and miss these artists that end up leaving or etc, but life is just like that. We are not always entitled to receive a reason. I realise also that I was a person with a lot of knowledge on such subjects...... it is no longer the case, I'm afraid... it's funny, really! I talk with a couple of my friends that are still involved in the fandom and I am always out of the loop now haha...
Also In this specific case, this artist was........ I dare say "worshipped". Dangerously so. Which is something I dont really agree with. Fans are good, fanatics arent as much... Artists are regular people, just with a different skill set than others. And while this isnt true for them, just because someone draws well does not make them a good person either.
Maybe a little off topic, sorry! But I think take solace in the fact that they are probably out living their best life right now! It's not much, but yeah. Please dont immediately think that anyone who has left is.... dead... that is weird grim thinking lol