How can an ethereum application be called decentralized and unstoppable if the owner has full control over it ?
Well because normally, a Website or app, would be on a server somewhere on the planet, but because it is just on centralized server, it is really easy to attack.
And with Ethereum there is no centralized attack point so it is always decentralized.
And the owner only Writes the code and then uploads it to the Ethereum network, he can't change anything after, when he supplies the code it is final.
The owner would need to write the self destruction in the code already, when he does that people will find out and warn others.