I look around at my neighbors. Maybe 25% of them would have the reader and know how to view that SD card.
I'm not trying to win the argument here, but I would like to know why a simple name and phone number on a label isn't 100% sufficient for you guys. I keep wondering if I'm missing something.
When someone finds a sUAS locally they turn it into the Sheriff's Office (or many have anyway). We always open it up and check out the SD card for any "Clues" of the rightful owner. No clues no return to owner.
The SD card is NOT a replacement for FAA# and Physically putting your info on the aircraft but it is a good idea and may offer a small additional peace of mind to the operator.