The EC2 Mac instances use unmodified Mac Minis installed into racks on service sleds. You’ll also get full access to your own machine that’s not shared with any other users, rather than just a virtualized instance. “We wanted to make sure that we support the Mac Mini that you would get if you went to the Apple store and you bought a Mac Mini,” said AWS VP David Brown.
You’ll pay for that privilege. It costs $1.083 per hour with a minimum 24 hours to get started, with billing done by the second thereafter. That’s considerably more than other Mac Mini