Btw, crypto (like bitcoin) is only an alternative because of convention.
The complete history of bitcoins is globally trackable, and people could all decide that they'll pay more for bitcoins that came from Satoshi's initial hoard, or that they'll refuse to accept bitcoins that were ever seized by the FBI.
(Yes, there are mixers. But you'd just refuse to accept any bitcoin that took part in the mixer transaction, if any FBI coins were in there.)
I'd like to introduce you to Monero, which isn't globally trackable and also properly fungible so you can't refuse mixed transactions (since all transactions are protected).
Apparently it powered online drug marketplaces before Bitcoin existed.
With crypto you don't hand over your coins to a third-party for safe keeping, you instead send coins directly to one another, just like with cash.