I was able to access the community-plugins.json link you shared in the beginning. But then I swithced to my hotspot from my mobile and then it stopped working.
Now even if I switch to my older network, its not working any more.
And now that you mention it, I have actually used my hotspot from my mobile in the morning before posting this question.
But now I’m not able to get it to work irrespective of what I try.
Same issue with myself as well from India. Every day for a few hours https://raw.githubusercontent.com/obsidianmd/obsidian-releases/master/community-plugins.json is inaccessible and all my plugin installations and settings vanish and due to the sync with Gdrive every devices are also affected. Internally Obsidian can handle this a little gracefully in my opinion, when GitHub is not available at least use only the installed plugins and not revert things.
Painful to customise Obsidian every day with plugins. Thinking to switch back to Roam research.