HIPPA stands for Health Insurance Portability and Accountability Act. The "Privacy" component of HIPPA is very limited in scope. Even with HIPPA the data being shared would be consistent with definition of "Limited" dataset.[0] At least in United States there is significant precedent for sharing such data, including even for marketing purposes as decided by Supreme Court case (IMS Health vs Sorrell).
it was a round about way to resolve the issue that google wallet/android pay wasn't accepted at many places. The solution is about as dumb as it sounds. I liked it because it was a really quick and easy debit card essentially. So I would use it at places I didn't trust since I could limit the amount on the card.
as is, they can rest on top of your glasses, but it looks weird. Companies are looking into making prescription lenses to fit on to the frame. There will likely be options when/if it becomes a consumer product
this reminds me of the science book I had as a kid. After reading it, I made blue waffles and my mom said they were the worst ones she ever tried. wasn't like i replaced water with food coloring