This particular idea probbaly has technical limitations.

A device can only monitor and analyze and modify what a user is viewing if it’s being used as a pass-through device in a daisy chain of devices.

As long as there is any device out there that can take multiple video signals from different inputs, let the user choose which they want to use, they can just not daisy-chain them, have them connected in parallel to different inputs. And even if one could try to get manufacturers colluding on creating a world where daisy-chaining is the only option, they have no incentive to do so on this point – in doing this, they’re trying to steal eyeball time from each other.

Now, that being said, I suppose that device manufacturers may not care, if 95% of users are going to just daisy-chain their devices. If it’s only a few privacy nuts out there who are constantly keeping on top of the latest shennanigans and figuring out how to avoid them, if the Roku manual says “daisy chain” and most users just follow the pictures there…shrugs