Leaderboards Info
Instead of using Google Play Games as the provider for the leaderboards, the game will be using SilentWolf. This would allow the game to be published in other platforms (like on Itch.io) with the leaderboards in tack and cross-compatible.
I think you are here because of one thing: the login page. There are several reasons behind that decision:
Your score will transfer over to another device. It would be like a cloud save and your score travels with you no matter what device you are using.
It acts as a verification that you were the one who scored and not an impersonator or someone who just so happen to share the same name.
If there would be an in-game shop (cosmetics mind you), all of your purchases will transfer over to another device along with your high-score. The shop is still tentative and it won't require real cash, just points you earn in-game (also implemented someday).