Earlier quoted context omitted.
That's not entirely true, you DO get syncing with no plan, just not unlimited syncing. But yes, I agree it is expensive for just connecting to somebody else's service. https://support.remarkable.com/hc/en-us/articles/44082491463...
"Just connecting to someone elses service" is a pretty thankless job in my opinion. I write software that can connect to 3rd party services. It takes a lot of effort to make sure it all works. There's always stuff that breaks randomly, and it's really hard to debug because you typically get only vague error messages when something fails, and you can't debug from the server side. So you end up spending way too much ti…
With your app you don't have a hardware business to support you.