AT&T is not building a cloud gaming business — but it might be angling for a cut

For many months, AT&T has been dangling a tantalizing possibility: what if its network let you instantly try blockbuster games for free? The company started by generically bundling free six-month subscriptions to Google Stadia and then began letting its customers stream full copies of Batman: Arkham Knight and Control over the internet. Next, it hinted at something even more intriguing: a try-before-you-buy game service where you could try a game directly from a search result, buy and…