[car_analogy]

> Facebook has hidden much of Instagram's content behind logins, so that makes most of it "not public".

1) It was public when the content was posted by its authors. Facebook locked it down retroactively, regardless of the author's intent.

2) A login requirement doesn't make it non-public, if making an account is trivial, and there are already hundreds of millions of accounts. Is the plot of Avengers: Endgame also not public, because it's locked behind a ticket purchase or subscription?

[wraptile]

Also login requirement is not certain. e.g. Google doesn't need to login to index those pages, neither do you for first few profiles. Only after your identity (ip or fingerprint) is know instagram starts locking public content behind login gates.