Before i start digging into it, does anybody know how they do "No mature videos on YouTube" (in the "kids" filter) with just DNS?
It appears this is functionality provided by YouTube themselves where you can set a CNAME: https://support.google.com/a/answer/6214622?hl=en#zippy=%2Co...
$ kdig +tls www.youtube.com @kids.dns0.eu
…
;; QUESTION SECTION:
;; www.youtube.com. IN A
;; ANSWER SECTION:
www.youtube.com. 300 IN CNAME restrictmoderate.youtube.com.
restrictmoderate.youtube.com. 1611 IN A 216.239.38.119