The retail media network space continues to heat up as another giant prepares to make an entrance. Costco is building an ad network that can draw on shopping data from 74.5 million household members. The network remains at the testing stage and Costco is said to be in conversations with various adtech vendors.

A U.S. district court judge has ruled that Google acted to create illegal monopolies in online advertising technology in a way that blocked competition and allowed higher ad prices to be charged. Google will appeal; meantime, the government will decide what to ask the court to do to remedy the monopoly. Google also faces a new U.K. antitrust lawsuit over its dominance of search.