Google intentionally allow app developers to do this. They have chosen to leave this option on the table. They could have just as easily chosen to make the inst

Google intentionally allow app developers to do this. They have chosen to leave this option on the table. They could have just as easily chosen to make the installation of apps from third-party sources impossible or prohibitively inconvenient. One app is not going to change Google's approach to the Play Store, even a multi-million dollar app. The vast majority of apps don't have the marketing power to profitably circumvent the Play Store, so cutting fees across the board would be a huge net loss for Google. Offering special discounts on the Play Store fee is a very slippery slope - if you offer it to anyone, everyone is going to start demanding it. It would undermine the value proposition of the Play Store and create a two-tier system, with one rule for blockbuster apps and one rule for everyone else. App developers begrudgingly pay the Play Store tax because it's preferable to the alternatives. They'd very much prefer to get all the benefits of the Play Store at lower cost, but Google has absolutely no reason to sell their service at less than the market rate. One outlier does not change that equation.