Flash Player is buggy and always vulnerable to attacks. Lots of website ditching Flash Player and embracing new alternates.
In CF, Flash Player is needed to view the code during hack. You can't copy the code and I think that's the reason to use it.
But wouldn't it be nice, if same functionality could be implemented without the need of Flash Player.
Just a thought. Hope MikeMirzayanov will take this into consideration for this awesome platform.
I've just tried to save an image with 464 lines of code as PNG using Photoshop, the size of the image was 611KB. So I think it is not a bad idea to draw the requested source code on an image and view it.
How about 3D Unity instead of Flash Player?