> Sites meant for children would not be adding the header.

Is Wikipedia "meant for children?" Should they be fully denied access to it? Should Wikimedia be fined if they make a mistake? If they get fined often enough do you think they'll just turn the header on everywhere in order to avoid risk?

Replace Wikipedia with any other mixed content site you prefer.

Child specific sites would not add the header. Anyone else could. I add it to my hobby sites. Some porn sites already add it to their sites [1]. Shodan can't reach my sites. I do not want small children on my blogs.

Add it to any site not specifically meant for children, that is totally fine.

[1] - https://www.shodan.io/search?query=RTA-5042-1996-1400-1577-R... [ Follow Links At Your Own Peril ]