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It's high time we demand open-source messaging standards across all platforms.What, like this https://github.com/signalapp?
The only thing holding this back are end users. Not corporations or governments. A safe, vetable 'standard' exists, it just needs ratifying by a standards body. It is available cross platform and is free of charge and free-as-in-beer (mostly AGPL I believe).
Messages app exists to send SMS, MMS and soon RCS. Apple developed a convenience feature that allows users to send enhanced messages to other users of the platform. Since the platform is successful and has had compelling and useful features added, it has found popularity in territories that traditionally had free or cheap SMS bundles. The rest of the world didn't have this golden noose and settled on other platforms (WhatsApp, FB Messenger, Telegram, Line, WeChat, Signal, Viber, etc...) across all platforms.
Edited spelling/layout.