The first-generation Apple TV will be near useless in three months' time. Apple will discontinue iTunes support for the device from 25th May, which means it won't be able to connect to iTunes.
That means no app updates, or app downloads whatsoever.
It's hardly a surprise. The first Apple TV was released all the way back in 2007. Apple describes it as an "obsolete" product. Hence it's not updating it to give it new security provisions.
Tech companies always stop supporting old hardware and software. And 11 years is pretty good going. Microsoft only supports versions of its Windows operating system for five years, and then gives them another five of "extended support" – basically bug fixes and patches, but not design changes or full security updates.