That is major motivator for using DDG. If you find something wrong, just tweet it (or somehow convey it to Gabriel), and he be on top of it in no time.
Just wait till it gets bigger and he's unable to answer them
Agreed. My first search will be how to switch the default search engine in Safari...
If you go to the homepage and click on Add to Safari, you will see your options in a grey box in the upper left.