I find @Keychat ‘s stamp system to be so refreshing.
1. It’s an honest and sustainable business model.
2. If each stamp can be a tenth of a cent, it’s much cheaper than the SMS days of 2007, for example.
3. Assigning value to sending of messages also incentivizes upgrades to more rich communication like phone, video, or 😲 face-to-face.
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Simple and reliable.
Voice and video calls can use the open-source WebRTC solution, which Signal and Google Voice likely both utilize.