A cheap used mini desktop with a linux install on it is also a good way to go. Throw in a wireless mouse and keyboard and you can do not only what an AppleTV or Android box does but also everything a cheap used mini pc can do.

Even something like this: https://www.ebay.com/itm/127547167640

Would be a media powerhouse compared to almost any set top box you can buy.

Throw OpenElec or OSMC on it for simple media setup or Bazzite or Ubuntu for a normal linux desktop with downloadable applications for most streaming platforms.

I'm a Linux user myself, and into hardware and self-hosting, so I have hardware coming out of my ears, but I wouldn't dare try and use a Linux box in the living room.

My wife and kids use the living room TV most, I barely use it, and only then if I'm watching with them, they use all of the streaming services so they want it to play in 4K and "just work", for which Linux is unfortunately not the solution.

The down side is if you actually want streaming apps with 4K support for the paid services.

I've been using NVidia Shield TV (pro) since the first gen, still have my OG device as well as the updated models. I'm also running a Beelink SER8 with Bazzite for some living-room gaming and classic emulation.

Apple TV 4k has an idle power draw of 0.49W and a 4k streaming power draw of 2.31W. That mini desktop will likely run at around 20W idle and approaches 30W under relatively light load and up to 60W on high loads. Plus keyboard and mouse are generally terrible couch devices. I've already got a NAS and plenty of devices I can stream from. The Apple TV is an almost perfect small and efficient device to stream to.