That's why I bought mine. I don't want to give Amazon any of my money.

I had three readers from Sony (until they exited the business) and one from B&N (until they exited the business), because I didn't want to deal with conversion. Of these still in the business, Amazon looks the least-like to exit soon, and now there's no need to deal with conversion.

As most of the books I read are out of copyright anyway, I'm not "encumbering" myself with Amazon in any way, except for buying hardware they made.

> no need to deal with conversion

There is still a need to deal with conversion, but it happens on Amazon servers. Which is convenient, but gives no control over the results (and someone mentioned in another comment that it doesn't even preserve the cover image).

The Kindle itself does not natively support ePub. MOBI is being retired to favour AZW3, and Microsoft is moving to ePub.

> one from B&N (until they exited the business)

Did they exit the business? It looks like the Nook Glowlight 4 was released less than a year ago.

I don't know a single person in real life with an e-reader other than a Kindle, including myself, so I had to google to see how B&N Nook was doing when you said that, but it still seems to be a thing.

Just checked — they indeed still have one model (not counting special editions in pink) after a hiatus of four years. Without an SD card, sideloading is an issue though.