You would be right if there's a popup box with two buttons appearing before installing the model and before every time it's used by some site.

Button 1: "Stop the AI now to save X GB of RAM".

Button 2: "Erase all browser AI to save X GB of RAM and Y GB of disk"

This isn't asking for consent, it's simply informing the user about what oversized resources are optional and providing an honest way to save them.

The only alternative to that is formal consent.