Google banned an app used for blocking ads from their app store as it was interrupting their core business, to subject their users to as many ads online as possible for revenue.
source: https://www.theguardian.com/media/2016/feb/03/google-pulls-ad-blocking-app-for-samsung-phones
archived source: https://wellthissucks.xyz/2016/02/03/google-pulls-adblocking-app-for-samsung-phones-archived-souce/