But the actual solution has been around for centuries. An artist can sign their work or tailor it directly for the purchaser. Artists have been doing commissions online forever now and you can have them write your name if you want. Anyone out there "stealing" work you bought is either saving something with your name on it, or they're modifying it to remove your name.
No artist views NFTs as a solution to an already solved problem. They're either seeing it as a scam and avoiding it, or they're seeing it as a scam that they can quickly cash in on. Countless artists are on twitter and various places online making rock-solid careers out of selling art commissions. NFTs were never a part of it. The people proposing it as a solution are the ones "investing" in NFTs.