Traffic correlation attacks are very difficult to mitigate. Even Tor is not immune to this (see research such as [1], and the Tor project's own statements that the design is not resistant to analysis by a global network observer). Also Briar may be unsuitable for some use cases where you want to remain anonymous to people you communicate with[2].

Some research has been done into communication networks that are resistant to traffic analysis, such as Vuvuzela[3]. Unfortunately most such solutions requires permanent connectivity and bandwidth utilization, which makes them impractical for battery-powered mobile devices.

I'm firmly of the belief that no communication tool is suitable for all use-cases, but that we need to build open interoperable ecosystems that fulfil a range of needs, and help educate people about them.

[1]: https://nusenu.medium.com/the-growing-problem-of-malicious-r...

[2]: https://code.briarproject.org/briar/briar/-/wikis/FAQ#does-b...

[3]: https://vuvuzela.io/

tor isn't perfect, but if that's good-enough for your use-case, you can use/host a server over it: https://gist.github.com/dllud/a46d4a555e31dfeff6ad41dcf20729...