Probably because it was done in plain sight and anybody could have worked through the implications then but nobody cared?
"I didn't realize that one day the media would convince me that this was a really bad thing" is not Facebook's fault.
Most people actually don't care if apps get their "data" and their friend list. But the media worked up a frenzy by vaguely connecting it to the Trump campaign (reminder that nobody blinked when Facebook openly gave everything to the Obama campaign), and now everyone has "realized" that Facebook is to blame for their problems.
"I didn't realize that one day the media would convince me that this was a really bad thing" is not Facebook's fault.
Most people actually don't care if apps get their "data" and their friend list. But the media worked up a frenzy by vaguely connecting it to the Trump campaign (reminder that nobody blinked when Facebook openly gave everything to the Obama campaign), and now everyone has "realized" that Facebook is to blame for their problems.