Nightshade: An offensive tool for artists against AI art generators

I hate that LLMs seem to be positioned to replace real artists (in specific, corporate niches) as much as anyone, but trying to poison the LLMs themselves just seems completely ineffective in the face of regular snapshots and QA, right?

Maybe I'm wrong, but I assume that any company trying to sell their LLM to anyone would surely be taking weekly (or even daily) snapshots of it and testing for degradation. If so, stuff like this seems pretty futile.