No picture of a child is a legitimate news interest. It has no public interest. And I meant pap photos seems to have decreased in the USA.
It is not illegal to picture the children in the UK, but unless parents have agreed you have to blur faces.
Archie and Lilibet are in the top 10 heirs to the throne, so they are public figures. Ironically, because their parents have shielded them so much, any picture a photographer can get of them is newsworthy.
I haven't noticed a change in the number of paparazzi photos in the United States one way or another. These days, everyone with a phone is a potential photographer.