Yes, sadly but true. You wouldn't believe how much Corbis has been making since then.
Lets say a newspaper needs a classroom for the front page... it's a big problem. Just imagine getting 30 some odd parents to sign consent forms and get permission from the administration and everything. So, they go to Corbis and ask for classroom photos. On the other side, Corbis knows this is a subject that is in demand, so during the summer, they rent a classroom, hire kids from a modeling agency and a teacher from a similar source. Get a photographer there with all the lights and everything. And the kids spend all day pretending they're in school...
The only times photographers are spared is for politicians, stars, criminals and rioters... that's pretty much it...