From the autumn for the applications laid out in Google Play, the new rules will take effect. So, the changes will affect games that offer to open chests with a combination of unique items for a fee. If before that the developers could not indicate the probability of a particular item dropping out, then from September 1 they will be obliged to inform the players about the chance of a dropout.
Google believes that the current state of affairs in applications that are more aimed at underage players is misleading them. If after September 1, the developer does not make the required changes to their applications, they will be deleted from Google Play as soon as possible.
By the way, similar requirements were introduced in the App Store two years ago.