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2 months agoHow about hosting an ADS-B receiver, tracking nearby air traffic. It doesn’t serve any practical purpose other than participating in the crowd sourced network that feeds sites like FlightAware and FlightRadar24 (and you get a free subscription by participating)
That’s assuming an attacker will play nice with URL forming and discovering edge cases in POSTing shaped data to the service. Just encrypting is still weak security if the whole front-end web and API surface isn’t hardened.