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> don’t allow third party compiled to connect

Not true. Molly works Signal-CLI works from what I've seen in the past.

They are unsupported, but not aggressively blocked. They are not allowed to be on the subreddit, probably because the subreddit is for SIGNAL and they don't want to deal with the headache of supporting users who use third party clients they cannot control.

> They distribute binaries on app platforms

They seem to support reproducible builds https://github.com/signalapp/Signal-Android/blob/main/reprod...

> and don’t allow third party compiled to connect

They don't want 3rd party clients to connect official servers, and do not support to them, but there is no outright ban.

They also have a weird crypto system baked in.

What weird crypto system?

Mobilecoin for Signal Payments, the one backed by Intel SGX hardware that keeps getting compromised: https://arstechnica.com/information-technology/2022/08/archi...

> Signal spokesperson Jun Harada wrote in an email: “Intel alerted us to this paper... and we were able to verify that the CPUs that Signal uses are not impacted by the findings of this paper and therefore are not vulnerable to the stated attack.”

https://support.signal.org/hc/en-us/articles/360057625692-In...