Since the beginning of the whole eBook trend I've refused to buy e-books from Amazon exactly because of their DRM, and recently I went looking around for an alternative and discovered Smashwords were I can buy the books and get them at least in ePub format (some also in other formats). They've been getting a steady stream of money from me ever since. (No, it's not a subscription, it's me being an avid book reader).
No idea of how good or not they are compared to other alternatives, but they seem to have more than enough choice for my needs and do satisfy my criteria, - the same as yours - which is that I when I download a book I get to keep it and read in any way I see fit.
Anna's Archive is a good option if you're wanting to sail the high seas. Very easy to navigate, and almost all titles are available in multiple formats (I.e. PDF, epub)
Seems like the starting point for this would be e-readers with open device content control. So instead of relying on my_email@kindle.com or something like that in order to get files onto the device, you’d use your own file server or something for the device to connect to.
Then the long-term ownership just consists of having the epub, mobi, or pdf files of the books you want to own, and passing them through whatever device content control system you’re using.
www.kobo.com is an online bookstore I use. I don't know if all their books are DRM-free, but the handful I bought have been. The full name of the store is Ratuken Kobo. I like it well enough.
They definitely sell DRM'd books, it might even be the majority of books on the store. I think it depends on the publisher. I have managed to find some DRM-free books there though.
Careful though, not every Humble Bundle is DRM-free. I just got one recently not realizing it was locked to the Kobo app. I have an Android e-reader so I'm still able to read them, but I'm pretty annoyed given that DRM-free used to be one of the major selling points of Humble Bundle.
For ebooks, the hurtle is really storing them on your own system. Most open source readers can read Amazon's .azw and .azw3. I like to keep everything in epub on my proton drive, but I buy (and sometimes don't buy) them from different places. I went to my local library to come up with a archival method that works. I use an open source ereader app on my phone and laptop, and use 'Send to Kindle' to get books on an old Kindle from 2014, deleting them when I'm finished reading.
By breaking up where I get my books from, and decoupling it from storage and reading method, I'm able to be a lot more flexible and take advantage of deals/exclusives on different platforms. I also feel a little more private. The downside is paying for storage, and an extra step to download books from the central location when I want to read them.
Buy it for Life
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