

>I can imagine that it becomes very difficult to keep track of.

The GDPR prompted them to make the data resurface, so it's not impossible to track this data given a few months of warning. It's just that Facebook as a company does not have an interest in deleting data they collected.

No - we've had the download your info feature since 2010 (https://techcrunch.com/2010/10/06/facebook-now-allows-you-to...). There is just a lot more public scrutiny now of what's in there - which found this bug.
