I like minidiscs, even if I’m too young to remember any popularity of them, I remember discs for Sony PSP which are similar in idea, an optical medium with protection like of diskettes.

And optical discs are not such a common good to think a protection case is too expensive or something. They get scratches.

But there’s another moment - optical discs also degrade with time faster than one would think when they were common. Mostly. Some are good.

About cryptocurrencies … I don’t believe that actually. That is, I believe many of them are scams. Or, one can say, very weird fundraising schemes for their creators. But there are uses, as one can easily feel when being in a sanctioned country.