Reddit can be used to view and access NSFW content on the DNS. I’d recommend doing the Google safe mode for Reddit too because it seems like a loophole. I believe the same can be applied to Twitter also.
Do you know if Reddit and Twitter have a “Safe Mode”? I believe that’s how 220.127.116.11 (Families) routes those requests to Google.
Simply googling, I get that both have only via settings and not dedicated URL.
This will never happen unless a dedicated safe mode URL is made available.
You can use the free Cloudflare Gateway to block additional sites of your choosing.