Anyone treating a blockchain as a database is already off to a bad start. It's at best a prunable transaction log. Sure, you can use a blockchain to construct a

Anyone treating a blockchain as a database is already off to a bad start. It's at best a prunable transaction log. Sure, you can use a blockchain to construct a database, but even the Nakamoto whitepaper talks about discarding old transactions. There exist many cases in which something is not illegal but is inefficient, unjust, lacks sufficient trust to reach a contract or lacks sufficient incentives to comply with a contract. There exist many other cases in which people cannot afford to hire a lawyer to enforce a contract, or cannot afford to hire as many lawyers of as high a calibre as the other party. So presenting blockchains as a) databases that are b) only good for illegal activity is doubly incorrect. There are also many bad and unnecessary uses of databases and contracts...