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Because these sites are fronted by CloudFlare, a block notice is accompanied by a padlock because CloudFlare terminates the TLS. [User] -> CloudFlare -> [Airtel] -> GitHub. Such notices make the block appear authentic, and vetted by CloudFlare.
Screenshot of a browser with codewithrockstar.com open and a block notice from Airtel.

The padlock is visible in the address bar.
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3. Warn your customers that use GitHub Pages A huge number of developers use CloudFlare to proxy their websites because Flexible SSL was the easiest and cheapest way to setup TLS a decade ago. Maybe these users should upgrade to Strict SSL today.
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