The Birdy app requires a work email, which then gets you on a wait list, so that you can subject yourself to their data mining:
Data Categories:
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The email address you use as username on BirdyChat network;
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Your messages and media within messages;
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User identifiers for blocked WhatsApp users;
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Usage information including timestamps related to your communication with WhatsApp users;
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Device and connection information such as IP address, operating system information and the BirdyChat version you are using;
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General location information using your IP address;
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Authentication information including encryption keys that WhatsApp encryption protocol uses;
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WhatsApp user reports in case a WhatsApp user chooses to share this information with WhatsApp.