i.e., you cannot fulfil your meatspace needs using cryptocurrency as of yet. It doesn't matter that you are able to isolate your identity online from your meatspace identity.
And this is what gov't can easily enforce - through money laundering laws. If ever cryptocurrency becomes prevalent enough to offer meatspace usage directly, you can bet your bottom dollar that gov't will regulate, and prevent anonymous spending (at least, for any large-ish amounts).
That's true. But still, cryptocurrencies could arguably remain useful, even if they never widely displaced meatspace money. I mean, consider how thoroughly online dark marketplaces have displaced meatspace drug dealers. And perhaps there are other suitable niches.
For example, cryptocurrencies could displace cash for gig economy tips. Maybe they already have, for all I know. Also for online porn and gambling.
i.e., you cannot fulfil your meatspace needs using cryptocurrency as of yet. It doesn't matter that you are able to isolate your identity online from your meatspace identity.
And this is what gov't can easily enforce - through money laundering laws. If ever cryptocurrency becomes prevalent enough to offer meatspace usage directly, you can bet your bottom dollar that gov't will regulate, and prevent anonymous spending (at least, for any large-ish amounts).