Right, they have Amazon's app store which is arguably worse than Google Play (and I say that as someone who absolutely detests Google). Their "free forever" apps are only free because you're trading personalized analytics for them, which can't be turned off without removing the app in question.

That being said, Amazon Fire tablets are good cheap devices if you want to experiment with custom ROMs and truly Free app stores like F-Droid without spending a lot of money or sacrificing your main device. Just don't trust FireOS to be any less privacy invasive than Google's Android.

Can you point out a FireOS tablet that's still being sold and the custom ROM that supports it?

You'll note that I said "experiment", not use as your daily/production tablet. With that said, all but the latest generation Fire tablets are rootable, and they are available at the usual places (eBay, Swappa, etc.) in new, used, and refurbished conditions.

There are Lollipop based ROMs for all 2017 and older Fire tablets (Amazon's FireOS is based on Lollipop so it's an easy base to start from) and there is work in progress to port Oreo to the 2017 Fire tablets:

https://forum.xda-developers.com/hd8-hd10/general/rom-androi...

"Android device" as in devices marketed as Android devices.

Context is not hard people. Don't nit because you can.

I believe you’re picking nits over the description of a commercial OS used by Google and Amazon and countless other device makers.

Cool.