Equality in itself is good for the public.
However, i don't think this is a reasonable perspective. Naturally, it should also extend to stocks and real estate.
Uh, no..? The argument is just what the OP says it is: 'investing' in crypto does nothing productive for the real economy and thus is useless to society.
> The gang would be able to buy all sorts of things with their counterfeit money...
Formally it is not counterfeit. The issue is that you afford buying power to some people that others are not afforded - inequality.
Equality in itself is good for the public.
However, i don't think this is a reasonable perspective. Naturally, it should also extend to stocks and real estate.