Danielle Cave, a senior analyst at the International Cyber Policy Centre at the Australian Strategic Policy Institute, called the heatmap an “open source intelligence gold mine”. She suggested the data also raised a cyber security risk. “A hacking group, state or non-state, could very easily now target Strava knowing how valuable the data is that they are holding,” she said. “If it does turn out that people can strip out the personal details of some of these Strava users, then I think it’s getting into a very dangerous place.”

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