OP is in favor of:

A) "non-state currency"

B) currency that "rival state-backed ones"

C) "solves problems"

One could argue cryptocurrencies don't solve any problem (good luck convincing Russians and Argentinians, but anyway). But they are "non-state" and they "rival state-backed" currencies.

Cryptocurrencies are absolutely a "non-state" and "rival state-backed" asset class, but I'd say it's mostly arguable, given the instability, illiquidity, and general inability (in most places) to exchange crypto for goods and services, whether they are "currencies".