I'm thinking something similar to what https://adnauseam.io/ does, but but amplified:
1. Someone reverse engineer what does the device send to which address. 2. Block the particular device to access internet (and make it easy for others too). 3. Constantly send bogus data to the manufacturer so the personal data they get overall loses value or is unusable. Make it easy for a lot of people to do it as well, or even just rent a bot farm.
There's too many legit and good services that end up being turned down due to abuse and DDos, and they don't even bring anything good to the attackers. Why not using these techniques for something actually good to consumers privacy?