LAION-5B is notoriously badly labeled that having a few poisoned data, even if it worked as advertised, would literally not matter at all.

Plus, it's not doing anything to existing diffusion models that used LAION-5B, since many artists are under the mistaken impression that the models will constantly scrapes the Internet for new images and train on them automatically, when training a model to learn new information without catastrophic forgetting is almost impossible (hence, workarounds like LoRAs and such).

Again, a reminder that the creator of Nightshade and Glaze, Ben Zhao of UChicago, is literally a code thief who stole GPL code for his closed source product (warning: reddit link) to scam artists who doesn't understand the tech behind ML models.