The vast majority of “real” currencies are fiat currencies and don’t have inherent value or use either.
US dollar hasn’t been backed by gold since 1971, for example.
The only reason money has any perceived value at all, is because it’s collectively agreed to have some value. Just like crypto currencies.
I, personally, use crypto to do art commissions (I’m an artist) and to pay my VPS’s rent. Neither is an illicit good or related to money laundering.
And, honesty, it’s pretty great, compared to alternatives.
Last time I’ve used PayPal, it decided to withhold the funds for a month, for whatever reason. Plus, the transaction fee was about a dollar.
Transferring the same amount of money via Monero is guaranteed take only about a minute or two to process, since a transaction in that system would never get withhold, plus the processing fee would be about a hundred times smaller.