Lightning was put on the iPhone in 2012. Other phone manufacturers switched to micro-USB in 2009 at the behest of the EU. Apple even released a micro-USB -> 30 pin connector to comply with the law.
Digital cameras, and other devices do have a habit of picking other connectors.
There were two 30 pin connectors by the way. I had to get an adapter to use my 3g iPhone on an older car stereo that supported iPods. All it did was flip a couple of the pins around.
