If they'd charged a subscription fee they might have more incentive to run the servers. Too bad their focus was on "no monthly fees"!
Dish also might have an upcoming/future motive to get Slingbox users to replace it:
In 2013/2014, they changed the way that it was handled.
I have 4 Slingboxes -- one in Miami, one in Kentucky, one in Cincinnati, and one as a "backup," -- and am really kinda bummed by this decision.
In fact, all patent applications (in the US at least) are published into the public domain. Feel free to download all of Apple's patent documents from uspto.gov, print them on T-shirts, and sell them on the street corner. *
You just can't build the devices described within the patent and sell them.
*(don't actually do this because I'm not a lawyer and their patent documents may contain mentions of their trademarks which have their own rules)
Hopefully, my indignation at the absurdity of software patents is now clear.