It can be frustrating to see the gym one worked so hard to take over slip away from your hands, but for those dedicated enough and willing to bend the rules (or rather, break them), there is another way; a recently discovered exploit allows players to set a Pokémon egg as a gym leader. However, because eggs are not equipped with attacks nor hit points, they can't actually be defeated, meaning the player who got the egg there will keep the gym indefinitely, reaping all the benefits of it. Niantic has not yet commented on the issue, but rest assured that the perpetrators will—probably—be banned.
Current reports have mostly come from New York City, with even the gym at the New York Times headquarters falling victim to this exploit. What about you? Have you seen egg gyms in your area? Leave a comment and let us know!