raw.githubusercontent.com is (or was) used for downloads of e.g. prebuilt binaries from GitHub. It probably affects the distribution of a number of circumvention systems.
Wow the GFW just blocked all of raw.githubusercontent.com …that’s all of specifically “raw dot githubusercontent dot com” not all of GitHub – aka a smart way to block binary distributions of Lantern installers on GitHub, likely amongst others.
Here you can see Lantern updating links:
I don’t see any mention of the blocking at https://www.githubstatus.com/ (archive). However I just now tried downloading a file (https://github.com/getlantern/lantern/releases/download/5.6.4/update_linux_386.bz2) and it used an S3 URL (https://github-production-release-asset-2e65be.s3.amazonaws.com/1380117/87603580-fbc1-11e9-9bc4-18fc78456f13). I’m not sure if it used to work like that or not.