Right... why do you think the perpetrators or ransomware attacks demand to be paid in crypto-currency, instead of via a plain old wire transfer which according to you is more opaque?
For one, accounts on it are pseudonymous. If by "transparency", you mean "every activity can be traced back to a meatspace individual or institution as recognized by a national government and/or law enforcement", that is a different level of "transparency".
It's not being compared to wire transfers but to server-side software (including those responsible for executing legacy wire transfers).
Because it's still less tracesble than a bank account, but unless one converts it in a dex to something truly untraceablr like monero or zcash, ones attempts to transact with it will be traced, so you won't be able to do much else with it. Coinbase and all other exchanges are known to freeze coins linked to illegal activity.
