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"We continue to focus on eliminating bots and scrapers from Pokémon GO. Rooted or jailbroken devices are not supported by Pokémon GO. Remember to download Pokémon GO from the official Google Play Store or iTunes App Store only."
left: from updating from 0.35 to 0.37. middle: from a clean install of 0.37. right: what people with rooted devices are seeing (image credit: Adrien)
But there is always a way to get around it.