Comment by dhx

See [1] for an overview of "state of the art" metadata-protecting communications protocols. There has been much research into this problem over decades and the effectiveness of such protocols very much depends on real world use cases and practicalities. For example, protocols may require 100 seconds to send a message to ensure adequate mixing, and then may be limited to always-transmitting-24/7 endpoints consuming much power, and then also requiring participants in the network to trust each other not to mount a denial of service attack.

[1] SoK: Metadata-Protecting Communication Systems, Sajin Sasy and Ian Goldberg, Cryptology ePrint Archive, Paper 2023/313, https://eprint.iacr.org/2023/313.pdf