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That's why Apple went so hard after Beeper Plus, a service that enhanced iMessage's security by making conversations between Apple and Android users as private as chats that were confined to Apple users:

https://pluralistic.net/2023/12/07/blue-bubbles-for-all/#never-underestimate-the-determination-of-a-kid-who-is-time-rich-and-cash-poor

It's why Elon Musk periodically freaks out and suspends users who list their Mastodon userids in their Twitter bios:

https://techcrunch.com/2022/12/15/elon-musk-suspends-mastodon-twitter-account-over-elonjet-tracking/

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