According to the Wall Street Journal, until November the app would have had access to the MAC addresses of its Android users. These addresses are unique codes for each device and cannot be changed. Unlike cookies, in fact, it is not possible to delete or deny permission and that's why they are very attractive for advertisers.
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⌨️ I am Vincenzo Tiani and you can find me on LinkedIn, Facebook, Twitter and Instagram or by following #DigitalExplainedbyVT