NFTs do not solve the problem of proof of ownership. Nor can they. If someone steals it from you - whether by trickery, force, or any other means - it's just as lost to you as any other stolen thing, digital or physical. (Not to touch on the fact that NFTs to date have just been URLs to web hosted media, i.e. ridiculously non-unique and insecure.)

Also, your whole paragraph about theoretical NFT replacement for DRM is just describing a different kind of DRM.