A map of countries in which Signal provides domain fronting and where Signal is blocked.
Sources: 

https://github.com/signalapp/Signal-Android/blob/main/app/src/main/java/org/thoughtcrime/securesms/push/SignalServiceNetworkAccess.kt
https://techcrunch.com/2021/03/15/signal-is-down-in-china/
Own work

Based on BlankMap-World6, compact.svg
Dodi 8238