Developers do need to go through a prior application process and do some legal work to get their gambling apps listed on Google Play Store.
Google is updating its policies to allow gambling and betting apps in 15 more countries, including the US, Australia, Belgium, Canada, and more. It will allow developers to make real-money gaming apps. They will be enabled to add in-app ads related to real-money gambling, and daily fantasy sports apps available on Google Play in the eligible countries. Up until now, Google allowed gambling and betting apps in four countries. These regions are Brazil, France, Ireland, and the UK.