Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
16" MacBook Pro Now Available
Apple Wins Initial Ruling [Updated]
It was reported that earlier this month that lawyers representing these sites were challenging these subpoenas under first amendment protection.
The ruling is expected to be appealed.
Update: It appears the final decision about this issue may not be made until early next week.