The ad-tech leader just overhauled its data marketplace to make third-party audience data cheaper and easier to use -- and it put AI at the core.The Trade Desk (TTD -1.21%) operates the largest independent ad-buying platform on the open internet. On Monday, the company unveiled Audience Unlimited, a major upgrade to how advertisers access and apply third-party data on its platform. The new approach aims to push data from a nice-to-have to the default setting -- removing cost surprises, reducing guesswork, a ...