(the success of the platform will be directly related to the amount of useful work that can be accomplished using it
You do understand that this is an kids device, right?
But then the first condition says:
Every entry should be your own original work
I don't understand. How is this a problem?
If the QR idea takes hold memorials will be able to tell much more to future generations
Yes, put obsolete technology there. Why not just put floppies?
You don't need QR codes for that information anymore. Everything is saved anyway. You could just put the persons social security number there and all that information and much more would still be available.