So, how are they making money on this?

I just spent some time uploading more travel pictures to my Flickr collection and uploaded to Google Video several short videos clips that I took in Africa and India several years ago:
Samburu dancers, Kenya Africa
Samburu school children singing, Kenya Africa
Elephants, Kenya Africa (30 seconds before a male elephant charged us)
Crocodiles being fed chickens, Samburu Lodge bar, Kenya Africa
Dancers in Kochin India

While I appreciate the free services, where is the profit? I do understand the value in collecting information on people, but I wonder if some web services like Google Video and Flickr will always be loss-leaders.