I would imagine YsNet would have some cash in reserve to pay current staff, and like
@tomboz said, anyone who's a contract worker would be off the books by now. I forget, did YsNet have any releases before Shenmue III? I thought I remember hearing about a mobile project or two but I could be mistaken.
They could be working on QOL improvements for the Steam release as
@Down by Law mentioned, and it's possible there's some early legwork being done on Shenmue IV (remember, they'll have to essentially "re-pitch" the game to publishers).