"An NFT minted by someone who doesn't hold the rights to the digital asset it is supposed to represent."
? The owner of Dorsey's 'first tweet' does not have any 'rights' to it.
There are generally no 'rights' transferred with NFT sales.
Anyone can sell Dorsey's 'first tweet' by putting a given URL in the NFT.
The way we evaluate the 'legit' one is by tracing back to the original sale. So it's a matter of convention to determine the difference between 'real and fake'.
That's an inherent problem in the marketplace.
'It's marketed as way for content creators' etc. etc. just like Amway is marketed as a way for regular folks to sell cleaning products.
The difference being, the grift is so big, that everyone has to pay attention.
The systems may adapt and yield better mechanisms, but still, I'm wary that there is such a thing as a solution.