A dedicated reader is not an "open" device, and it's not sold for the purpose of installing your own applications on any more than, say, a dedicated MP3 player is. You'd be laughed out of court.
The Windows browser issue was different in that a Windows PC does have the express purpose of the user installing their own software on it, but Microsoft were perceived to be putting their competitors at a disadvantage by bundling their own browser with the o/s.
There's no law against selling "closed" devices.
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