Because one day, hopefully in the near future, Adobe Flash will extinct. Though the webmasters will be too lazy to replace the Flash content with HTML5+JS thus pushing the glorious date of its extinction further into the future.
Obviously this thread is related to Unreal Software (and not to CS2D), rip...
Anyway, yeah, I noticed that too just few weeks ago that DC changed that portal to something without Flash. Fairly sure, DC wants to bring something new in that Portal in the future (not sure though).
Yes, I want to get rid of all Flash content on this website. It's still in some other places (Comics and Stats) but these pages are not as important as the portal page so I didn't care about them yet.
My actual aim is to replace it with dynamic Javascript stuff later but I didn't find the time to do so yet.
So the static image there is basically a placeholder.