Yesterday, Google announced a handful of new policies for Google Play aimed at making the storefront safer for children. Those weren't the only tweaks to the rules, as Android Police also spotted changes to Google Play's policies regarding loot boxes, hate speech, and sexual content.
For loot boxes, Google Play now specifies that "Apps offering mechanisms to receive randomized virtual items from a purchase (i.e. 'loot boxes') must clearly disclose the odds of receiving those items in advance of purchase." Apple first implemented a similar requirement for iOS developers in December of 2017.