What is the sea salt craze?

I was in a discussion about sea salt today. In the states, there has been a huge wave of change. Everywhere I look, chips, popcorn, peanuts and other prepared foods, I see labels which say sea salt was used.
Why?
Sea salt is offered as a table salt, but non of the sea salt has iodine added. Wasn’t that done originally to improve health?
Should we be taking iodine supplements?
I have wondered whether there is a dwindling supply of fresh water so extreme in some places, that desalination has become necessary. If that was true, then selling the sea salt would be simply finding profit from a by product. Otherwise, isn’t it quite a lot of bother just to season food?
Please, volley facts, thoughts, and conspiracy theories as they come to mind.