I don't even want promotions. Make it opt in rather than opt out. I buy things with the expectation that they will just quietly do their job.
Who needs a computer in their fridge anyway? Is the utility worth the materials and add complexity besides to advertisers?
Lets just add laws where if advertisers want something, we always do the opposite.
Solids are not enough, you also need to make sure there are no additives, etc. Feed your baby a live cow.