Building something on the web on your own platform means you own it, control it, and are not beholden to anyone or any company provided you are reasonably within the law.
Building an app for iPhone? You're sharecropping. Android App? Sharecropping. Facebook? YouTube? You guessed it.
My friend Ryan Bates build railscasts.com but has been on hiatus for almost 4 years. Even so, his site still has value, and at any time he can pick it back up again and start rebuilding. If you love freedom, I don't know why you would pour your life, mind, and skill into anything that's sharecropping.