Block TikTok with pfSense
The following page on netify.ai provides details on domains, platforms, networks and IPs used by TikTok.
The coygeek page provides detailed steps to add the list of TikTok resources to a custom block list.
Netgate has a forum post has some pretty good info about blocking Firefox DoH (DNS over HTTP). To me I would rather block DoH to decrease the attack surface.
pfSense
Block DNS over HTTPS nonsense. DoH (firefox uses DoH, so could still reach TikTok). See this Cloudflare page to learn more about DNS over HTTPS.
https://pfsense.local/pfblockerng/pfblockerng_category_edit.php?type=dnsbl&rowid=5
DNS Groups
https://pfsense.local/pfblockerng/pfblockerng_category.php?type=dnsbl
Going to tiktok.com
will show it is now blocked.