‘Domain Fronting’ can be used to mask censored services by hiding them within infrastructure provider’s vast network. Amazon has now followed suit, with Google and Cloudflare also disabling the practice. Signal, the encrypted messaging app, could run unimpeded in countries where it had been blocked, including Egypt, Oman, Qatar and UAE. Domain fronting has been used by many services and projects, including Tor – short for The Onion Router. But it can also be useful for cybercrime and online espionage.”]
Source: https://www.inforisktoday.com/amazon-google-block-trick-that-let-encrypted-chats-flow-a-10954