You have just handed every website operator the capability to home in on your child's birth date. Age, combined with sampling over time, leaks birth date. If yo

You have just handed every website operator the capability to home in on your child's birth date. Age, combined with sampling over time, leaks birth date. If you add an X-jurisdiction-advise header (presumably so we can do lookups to figure out what laws are in force that we'd have to respect), you'd leak uour zipcode eventually. Creating a bunch of sites to do marketing shenanigans and demographic analysis via matching your traffic with other fingerprint data leaks, can lead to a reasonable approximation of gender over time. Congratulations, you've now managed to leak enough datapoints to be deanonymized. Do not do this. It is also a super terrible user experience, since now, changing the driver of the web browser requires what amounts to a login. I repeat, do not go down this road, there are bad things there.