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reMarkable is a brand of e-ink tablets.
Currently the reMarkable 2 supports connecting to and modifying the tablet with SSH. This is utilized by software including the reMarkable Connection Utility to do things like replace the lock screen, add new templates, add custom software, and more.
This market will resolve positive if the newest flagship tablet in the reMarkable series running the latest software update can be "highly customized", which I will define as:
The ability to replace the lock screen
The ability to add or remove templates
The ability to install custom software, like a game.
If this customization requires a jailbreak, the market will resolve negatively. Note that a positive resolution is not contingent on the SSH connection remaining available - as long as there was a way to do these tasks, whether it be through an SSH connection, third party software, or some officially supported app, the market will be resolved positively.
@MichaelSchmatz Ehh, it's been in that spot from the start. Has a pretty active mod/hacking community though.