Crypto advocates on this forum frequently list Argentina as a specific use case ( ie getting around foreign currency rules/restrictions ), that would imply that the market doesn’t just happen in “Cuevas”
As for the size: again, major operations -- the kinds that actually "move the needle" -- are done in the legal market. I seriously doubt crypto has any impact in Argentina.
Another way to look at it is that crypto is strengthening the dollar’s foothold in Argentina and weakening the state’s ability to manage their own currency, to extremely detrimental effects.