You do own your hacker news account. If someone hacks into your computer, and makes stupid comments while pretending to be you, you have every right to seek compensation. Because you actually OWN your hacker news account, in the very same way you OWN the house you are renting. Your landlord cannot just rock up to your house tomorrow, walk in and sit in your yard for an hour because they "own" the house. So yes, you are right! Ownership is and can be complicated, and NFT ownership is no different. ;)