Does Apple TV latest gen support other streaming channels

Hi I am looking to purchase the latest Apple TV to replace my current Roku device. I currently subscribe to:

Sling, Acorn, Britbox, Amazon Prime, CuriosityStream, are apps in the Apple Store available for those?

We live in a no over the air, cable or satellite area of the country so our options are limited to streaming.

I ask because I currently own a Mac Pro and the app store does not show apps for Apple TV and the Apple website does not talk about what is available.

Thanks for your help

Hal