Based off that list are you saying companies like T. Rowe Price and Citigroup are offering ETNs and ETFs that have fund compositions that are random for each customer?
Obviously the value proposition is a little bit different but it seems close enough to rhyme. T. Rowe Price and Citigroup aren't saying "the best part about these funds is that you have no idea whats in them!" but in practice these funds behave similarly to the crypto flash drives.
I don't think that the etfs disclose which assets are held on any given day. From the consumers perspective they are buying some mix of currencies, although they don't know exactly which ones. It seems pretty random to me, just not different from the other note holders.