If you are building a truly distributed blockchain that is decentralized then very hard to do. Building consensus to classify some trades as theft is hard to d

If you are building a truly distributed blockchain that is decentralized then very hard to do. Building consensus to classify some trades as theft is hard to do in-band. Even if do build such a workflow in the chain, how do you get everyone to agree ? Distributed consensus will take lot more time than attacker quickly making trades and moving the coins across multiple chains etc. If you centralize this action and have few people decide ( as has happened in some coins in the past) it is no longer a decentralized system.