In democratic societies, in theory and largely in practice, crime is what society as a whole decided is a crime.

Bitcoin is indeed permissionless, which means you can use it for things society might find nefarious: tax evasion, drug trade, uncontrolled arms trade, human trafficking, money laundering, etc etc. You might not value that, but society as a whole does.

Bitcoin is probably one of the worst asset to use for crimes, since all transactions are publicly available on the blockchain, with no privacy.

Bitcoin is one of many cryptocurrencies, one that becomes increasingly less relevant with each day.