Not that I know of. I had a book I was trying a buy a couple weeks ago, everywhere I found it had DRM. So I gave up. They lost a sale.
At this point I think Apple’s really the only candidate for it. Everyone else is either helped by DRM (Amazon, B&N, Kobo), too small, or just don’t seem like a good fit (Google). I was hoping they’d do it after doing so with music, but at this point I’ve given up.
So what happened afterwards?
Deutsche Telekom sold the infrastructure to Rakuten, the Japanese owners of Kobo , in 2017. Interestingly, 6 years later, Tolino still exists with the same DRM-free architecture and new devices are actually developed by Rakuten.