The above list of companies is respectable. And they re not the kinds of companies you'd expect to be using long-form programming to reach their target audiences. They have products and services that require time to explain in depth. They often have multiple distribution channels, so direct sales is not their primary objective. They re looking for cost-effective ways to use a mass medium to reach customers and prospects beyond prime time.
Most people watch TV for pleasure.
It's a passive experience. One can chill out in front of the television and take a break from surfing, or reading, or talking on the cell phone. Advertising tends to be intrusive during this time of passive relaxation. The most effective long-form campaigns work hard to entertain while they explain. They have to look good, for one.