(Edit, to clarify - not because of what it offers, but because the very existence of a subscription tends to create wrong incentives for the company so to try and push people onto them. Maybe not now, but this will happen. Guaranteed.)
Also, I don't see a properly supported way to actually get docs to/from the device without a cloud service, theirs or someone else's.
For example, [1] says
Transferring files using a USB cable
NB: This functionality is currently experimental,
as we haven't fully implemented it yet.
1. Connect the reMarkable with a USB cable to your computer.
2. ...
3. ...
4. Open a browser window on your computer and enter the address 10.11.99.1.
What the heck. They report their tablet as a network interface? And then use their app to configure it? Meaning that I can't get anything in or out the tablet if their app's not installed.If they will go bankrupt, the app will stop launching and you'll end up with a pretty precise-engineered dud. Worse yet, they'll get acquired and you'll be forced into a subsciption. No bueno.
This thing needs proper support for being accessible as a mass storage device. The rest is secondary.
[1] https://support.remarkable.com/s/article/Transferring-files-...