Pokémon GO will soon be six years old since it was released on mobile devices. Since then, the Niantic game has been constantly updating and improving its content, but that has also meant that from time to time it has stopped being compatible with very old mobiles or operating systems.
In a very short time that is the situation that those with a mobile phone that has installed Android 6, since the title will stop working on those devices that have this version. Of course, this means that those who have Android 7 or higher or play on iOS will not have to worry about this update.
Therefore, Niantic advises all users to update their operating systems as soon as possible if they want to continue playing games. Pokémon GO. The point is that the company wants to optimize its development process and concentrate resources on the compatibility with newer operating systems and technologiesHence the decision you have made.
At the same time, it has added that the vast majority of users will not be affected by this problem, which is why, as a large part of the community migrates to more recent versions, the game is modifying its requirements to focus mainly on devices that they use their player base.