At least when people got mad WALL-E was being added to Criterion it made sense that they were mad at a Disney film being Criterionized. With Frankenstein they're treating it as an affront to cinema that Criterion is releasing their seventh Guillermo del Toro film (but they personally don't like it, so)
If you don't like then it's Netflix's fault for refusing to release any of their films on physical media by any means but Criterion. It's not the fault of Criterion - a label that's always released commercial films to support itself - that you elevated it into the new western canon. But they likely would have put out Frankenstein regardless because they clearly like del Toro and put out all his films they can. It's likely these partnerships and more mainstream releases will only grow as more companies shift away from physical media and sign away rights to boutique labels
It's just weird that the anger over Criterion releases feels *personal*, like it's not only about the film "stealing" a place or about a film you think sucks getting the premium treatment but it's perceived as some kind of attack on them, too
