Because the seals on the mask itself weren’t rated and they didn’t go through FDA authorization. You HAVE to go through FDA clearance if you want to claim your product meets medical standards.
I highly doubt someone who’s struggling with a phone is going to do well with a screen projected on your hand that has very sensitive hand interaction requirements.
I don’t find this surprising at all. So many windows updates broke dual booting over years. They really don’t care and have no need to.