> Not having source is not much of a speed bump for a bug finder.

As someone who has found bugs in software thanks to having access to the source code, I call bullshit on this. I likely would not have been able to identify the bug myself without access to the source.

It is true that you can find bugs in closed source software, but it sure as hell is a lot easier when we have access to the source.

(I'm aware that code doesn't have to be Open Source for me to have access to it, but I feel that's splitting hairs.)