Sorry if this is a dumb question, but wouldn't it suffice to just ban the subreddits by their URL?
I believe that TLS could be used (and is used) in combination with other protocols, which only require the domain to use for DNS. Everything after that in the URL bar is HTTP-only.
Cloudflare has a small demo which you can use to test your browser and learn more about specific parts - https://www.cloudflare.com/ssl/encrypted-sni/
Quick tutorial from StackPath (much of it applies to Cloudflare Workers, too): https://news.ycombinator.com/item?id=19514791
I’m not familiar with the browser situation in India, but it’s yet another reason why we should recommend and support Firefox, and why we should avoid software and hardware from authoritarian countries.