A child born since Facebook's inception will be approaching 18 soon, and might have had parents who posted the child's entire life on Facebook from the ultrasound all the way to (maybe?) high school graduation.
When that child turns 18 and the child does not consent to tracking, what happens to all those photos, behavior, and YouTube videos that kid has watched? Maybe the kid starts as a clean slate since they've reached an age of majority, but how can you technically even keep track of that?
https://www.usatoday.com/story/news/nation-now/2016/09/16/18...
https://www.independent.co.uk/news/world/europe/facebook-fin...
Search for: "child suing parents over facebook photos" and you'll find plenty more.
Seems a little "too late" to retroactively remove consent some years later. That being said, I can see arguments either way that make sense. :/
And the parents do consent when the photos are taken.
Lets take a run at this one. I did specifically mention a couple exemptions above, which include expectation of privacy - a crowd in a public space don't have an expectation of privacy.
(In the US this goes further, where you can photograph anyone in public, with or without their consent, so long as it is within the nebulous "community standards" - but the US is not the norm.)
However, that's not the case for a wide variety of other photographs.
For example under the Australian Privacy Act:
> Images of individuals in photographs or video (images) are treated as personal information under the Privacy Act 1988 (Privacy Act) where the person’s identity is clear or can reasonably be worked out from that image. [0]
Similarly, in the EU, photographs or video of someone who can be reasonably identified within that work, is to be treated as Personally Identifiable Information under the GDPR, and thus requires consent. GDPR also requires you notify anyone in a public space ahead of time that you may be filming or photographing in the area.
I think it's fair to say that it is _not_ normal in most of the world to require no consent if you're not doing something commercial. Consent is the norm.
[0] https://www.oaic.gov.au/privacy/guidance-and-advice/posting-...
The GDPR doesn't directly include photographs as protected information, unless the are attached or connected to other info.
And it's worth noting that this is not about collection of data but use of data - if the legal basis of the processing was consent (perhaps there was a different legal basis, then consent isn't relevant) then withdrawing the consent does not make the earlier processing illegal, but it does require the controller to stop processing (using) the data they collected while they had consent and ensure that any processors to whom they delegated data processing do so as well.
Additionally, the child will usually not know every site their parent has consented to tracking use.