You can run arbitrary software on the Remarkable, in case you weren't aware (quite easily even, you can ssh in out-of-the-box) The supplied software isn't all

You can run arbitrary software on the Remarkable, in case you weren't aware (quite easily even, you can ssh in out-of-the-box) The supplied software isn't all Open Source, and I wouldn't be surprised if there's some drivers or firmware that can't be Open Source on it. But I don't see how it even _could be_ the e-ink part that's forcing the main UI software parts to be closed source.