> Like syncing local notes using common cloud services?

Technically this is present on the Remarkable if you're willing to fiddle with the device some. They give you root by default (and provide an ssh service if the device is connected over usb), and the community has implemented quite a few syncing options.

That said - I was also very bummed to see them introduce the paid service. I'd really like them to succeed by selling good & open hardware, not by moving towards a locked down device ties to SaaS.