We don't know for sure whether the leak is selective, but Facebook claims it is. The morality of the plaintiffs seems very relevant to evaluating whether you believe that.
You have a very uncharitable interpretation of Sir Berners-Lee's comments. He's railing against walled gardens being poor stewards of user data and having nonexistent data portability (as well as telcos violating net neutrality.)
Relevant then and even more relevant now. I see nothing about him wanting Facebook to enforce publicly-published profile data.
Actually, both normies and hackers were super concerned about this Facebook thing, and whether or not people were putting too much personal information on the internet.
Young adults - the early adopter demographic - didn't care though, because many of them weren't thinking much past boose, parties, and sex. And, thanks to network effects, you rather needed Facebook, if you didn't want to be a social pariah at your school.
Since the sky did not fall in an obvious way, eventually, their parents started using it, too.
Well the article linked is from January 2019, not "the early days". It's about a GDPR request that Facebook is/was avoiding answering.
Well then, all they need to do is leak more :)