Comment by zarzavat

If it's so easy to replicate, why isn't there any other app that has replicated it?

Signal is the closest but they fall short because they prioritize privacy over features. Which is their choice to make, but it means they have ruled themselves out from going mainstream. If you're not targeting feature parity with WhatsApp then you have zero chance of supplanting it.

Telegram prioritises idk the FSB spying on your chats, that app gives me the creeps.