If someone wants to install an advert app on their fridge (I assume in exchange for money) then fair enough.
If I buy a tv I shouldn't just have to accept that, now or in the future, the manufacturer will sell advertising on it.
* Ban all advertisements. (I'm all for it, at this point.)
* Make sure smart-devices make extremely clear that they can be used to show ads, and include trivial instructions to disable ads
Forcing ads onto stuff we pay money for is not okay. Ads to fund free content is probably unavoidable, but even then, it needs to be clear up front what you're subjecting yourself to. Unexpected ads on devices you don't expect them from, can be confusing and disorienting for many people. For people with schizophrenia, it can clearly be dangerous.
And I think this is not just true for smart fridges, but also for those billboards at bus stops that seem stationary at first until they suddenly start to move or talk to you. Ban those please. Or make it clear upfront that they're video. Don't spring this on unsuspecting people.
The other way around — make it clear that the devices are capable of showing ads, and provide instructions on how to opt-in to them (and no cookie-like prompts either)