No not in the US. While most Americans (~70%) are within 10 miles (16km) of a grocery store as foreigners would recognize them, the other 30% have either a Dollar General or Family Dollar. Just those two choices. Sometimes both if they’re lucky. For ~10% of Americans they are 30 miles (48km) or more from a grocery store and usually 10 miles from a dollar store.
With rising gas prices and the lack of infrastructure across the majority (>80%) of landmass in the US, many rural Americans have to have 4x4 vehicles in order to just drive to their job and back, so an extra ~3 gallons of gas for groceries doesn’t make sense as anything but a monthly expense; and even then statistically the only thing they could get to is a Walmart which is the most common grocery store in the United States; or just as bad a Kroger Brand company or Albertson’s brand company. Those are the three grocery stores that statistically exist for >95% of the US population, and theoretically if you’re banned from one in a specific brand family you’re banned from all in that brand family.
If it would be something that’s needed, that would improve humanity in anyway, maybe.
But here’s the problem, these will kill off entire ecosystems. The installation alone will do that, but also whatever anti-corrosion, anti-growth coating on the outside that has to be somehow maximally thermally conductive will do that. The ocean is alive, it wants to be alive, and that life destroys metal and organic matter. It also just eats through petroleum products and every single type of coating we have invented.
So no matter what these will be coated in some toxic paint, that will need to be frequently reapplied, like within 6 months of application, because we want to keep thermal conductivity and barnacles and various other sealife are what I would think everyone can agree are ‘insulating’ layers.
So where-ever these are will have an entire town built up around them for the constant maintenance; which again involves constantly killing off everything that grows around them and on them, while leeching toxic materials to the environment.