The Kobo eink use Linux, are easily free from adverts and subscriptions.
An ereader is like a CD audio player, a VHS, A DVD player or a dishwasher. It's a single use niche appliance, unlike a smart phone, tablet, laptop or so called "Smart" TV.
I'm convinced eink is too slow for decent note taking and for most applications other than reading non-interactive text. That's after years of use of different makes.
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