Ah, I see. Yes, it's still good for use with things like Smash Bros or unlocking content in games, just not for repeated use with games that have daily limits.Yes the PowerTag key algorithm is not fully understood so we can only use predetermined key. I think we can still randomise it to 6 different UIDs but it wasn't as high priority.
The fact that a rewritable tag can be had for quite a cheap price meant I wanted to get this out even with the limitations.