You cannot always verify who created the GitHub page. Some of these sites could be designed to steal login credentials or install malware.
: If a GitHub link asks you to download a file, patch, or extension to "make TikTok work," close the tab immediately. Reliable Alternatives to Unblock TikTok tiktok unblocked github io link
Schools block TikTok for legitimate educational reasons (distraction, bandwidth consumption, data privacy). By using a github.io proxy, you are actively subverting those rules. You cannot always verify who created the GitHub page