They are a mining pool - not a mega farm, and the actual miners have a month to switch to another pool. So, it should not affect global hash rate. A better question is, who are the actual miners that were using their pool and what was their incentives for it?
This company also had its own equipment that worked on this pool. Otherwise, it wouldn't have been profitable.
Only the mining pool is being closed, and they'll probably redirect the rest of their equipment to other pools they recommended. I didn't think that maintaining their pool was so expensive that the company decided to close it.