Regarding adult content, don't you think that there is a better solution? Websites could add a HTTP header containing content rating; if the header is missing t

Regarding adult content, don't you think that there is a better solution? Websites could add a HTTP header containing content rating; if the header is missing then it is considered 18+ content. Browsers use this header to restrict access according to OS settings. This way the problem can be solved without any IDs and credit cards. Also I don't understand why age verification is needed for Google Play. Isn't adult content already banned there?