This. What the protocol allows you to do is not a moral guide. You can spam people with dust outputs, you can bloat the UTXO set with unspendable outputs, and you can store arbitrary data on the blockchain. You can run a centralized service which blacklists certain outputs or overpays transaction fees by 100x. And you can steal someone else's bitcoin by finding their private key. The protocol is neither a legal nor moral authority, and just because you can does not mean you should.