Hospital staff in Thailand use LINE to do everything from organising shift rosters to trading images and instructions for patients. I have personally seen a (nurse) friend of mine receiving images of wounds from on-duty staff and giving advice for treatment over the app.
In the absence of some kind of really amazing and free dedicated app, it actually seems very efficient! I have zero faith in any of those mandated health information privacy schemes anyway.
That's too bad you have little faith. But that's because in Thailand there isn't any mandated privacy, or the laws are toothless. Here in the US, that nurse could be fined $25,000 every time she hits the 'send' button.
It's a regulatory and educational problem, not a technical one. While it could be improved, and it's far from perfect, there's no reason what so ever to believe it's un-fixable.
I can tell you for sure there are millions of people who don't care at all about having their pictures taken and sent over the net so long as tgey get an affordable treatment.
In the absence of some kind of really amazing and free dedicated app, it actually seems very efficient! I have zero faith in any of those mandated health information privacy schemes anyway.