No it is not. An image cannot be stored on any of the popular block chains. An NFT contains a link to an image, which the chain has no way of displaying, third

No it is not. An image cannot be stored on any of the popular block chains. An NFT contains a link to an image, which the chain has no way of displaying, third party websites like Opensea display the images. And you can never delete anything from a blockchain so your second point is completely false as well. And even if you could delete something from a chain it could not "drain" your wallet unless you explicitly gave it permission to use your coins.