Juli Clover, MacRumors:

The third-generation Apple TV, last made available in 2013, is slowly losing support from third-party app developers. YouTube recently announced that the YouTube channel will disappear in March, and now the CBS All Access channel is also being removed.

And:

The timing coincides with an upcoming shift that will see CBS All Access rebranding as Paramount+. ViacomCBS CEO Bob Bakish said in September that CBS All Access was being rebranded because the Paramount brand is more recognizable. The rebrand will be accompanied by original content designed to lure new subscribers.

And:

Though there will be no app on the third-generation ‌Apple TV‌, Paramount+ content will be able to be streamed from an iOS device to a third-generation ‌Apple TV‌.

CBS All Access and Showtime have a bundle deal. Will that deal continue under Paramount+?

On a related note, will we see a new Apple TV this year?