Crypto is the only way I can pay for VPN without disclosing my identity. Also it's the only way I can move money abroad without getting a special permission from my country's central bank (except physically flying with max $10k cash). Ah, and also there is a war in my country that may escalate any time, but thanks to cryptocurrencies I can run away with empty pockets and still access my money from anywhere in the world.
The black market exists for a reason and I don't want to take it away from you but that doesn't mean the entire world is going to adopt the black market.