EXCHANGE= SUPERMARKET
Exchanges only let you buy and sell goods at a temporarily basis and let you holds items for the sake of your convenience, this does not guarantee a lifelong protection of your goods that is stored or displayed on the supermarket for people to buy. Because if at the cause of an emergency and the supermarket burns down your goods are gone and nothing can be done.And this is exactly how crypto exchanges work.
What exchanges do
I don’t think you buy goods and keep them in a supermarket to hold the goods for you, even on an online store when you make a purchase of a good the online market companies gives you a date that your goods will get to you.
Exchange is not a supermarket, there is no where you are getting at with connecting exchange to a supermarket.