They're probably just doing other things, far as I know.
They've only posted three pieces of artwork on any of their professional handle outlets (three skeb commissions from mid-2023 and early 2024 on IG) since early 2022, and everything else -- including their professional site -- has been quiet since 2022.
Even setting aside the time stuff, they haven't done a whole lot of follow-up illustration work for the Touken Ranbu characters they designed, either, so I presume that it's they just aren't really interested in doing that commercially.