Current messaging solutions have different issues.
1. Not encrypted.
2. Transmission is encrypted but they are centralized, the message is open in the server.
3. End to end encryption but susceptible to block because some signaling/presence is towards a shard of central servers.
4. The infrastructure relays on well know properties of IP/TCP (proxies, ports...).
5. the packet has some well know properties (checksums, structure...) that allows to be identified and blocked.
5. Authentication and peer identity discovery.
There was a time (early 2000s) where Skype was a headache for system administrators, because it was able to pass any firewall and the conversations were able to pass. That is missed in the current world.
None of the current solutions, telegram, line, whatsapp, skype, email... can pass the previous checklist.
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