That's because you don't actually own the kindle.

I used KOReader for my Kindle and I never looked back. The software that Amazon ships is simply insulting. It's like when I installed Linux on my laptop instead of Windows. KOReader is a massive upgrade for any Kindle.

You can do a lot of the same things with a jailbroken Kindle and KindleForge.

https://www.youtube.com/watch?v=l4ZliC82RtA

You can jailbreak your kindle and get similar functionality through KOReader plugins https://omer-faruq.github.io/appstore.koplugin/

Give Rakuten your money!

I'm not. I want my Kindle to do ONE job well, not turn into another multi-purpose device.