I know why they do that. They are affriad of stuff like whitehouse.com (like in year 2000, not now). The problem is they are afraid of the URL because they are not sure it is correct or not. It might as well be a chase.org and for some reason, it is a phising site, or spam, or virus, or whatnot. Using the search engine, I suppose they would think the big company can do a better job, and perhapse law suit if it directed them to a mallicious site.