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*This answer is _my opinion_, not moderator/admin edict. Voting and feedback in comments still apply.*

Their site description says the site is for publishers and readers of ebooks.  Anything about publishing ebooks is on-topic here (and was on Writing.SE).  Reading is probably not unless it's stuff publishers or authors need to be aware of (like support for different platforms, if that affects decisions you make in formatting, packaging, etc).

Quoting from their [on-topic help](https://ebooks.stackexchange.com/help/on-topic):

> - How can I create a .pdf from a .epub file?
> - How can I export text from a .epub file?
> - What image formats can I embed in a XYZ file? (where XYZ is an ebook format)
> - What are the pros and cons of publishing in XYZ format versus ABC format?
> - What tools do I need to edit a XYZ file? (where XYZ is an ebook format)
> - Is there any software that will create an ebook from a Wordpress site?
> - Can I restrict an ebook so that it can only be read on certain devices?

All fine here.

> - I bought an ebook from _____. How can I read it on my Kindle/Nook/iOS device/etc.?
> - Why doesn't my Kindle/Nook/ereader show cover images?

Off-topic here.  But if you want to ask from the publishing side (supporting other platforms, making sure your images show up), that would be on-topic.

> - Are there any waterproof ereaders available for purchase?
> - My [ereader or electronic device] isn't working because [specific problem]; how can I fix it?

Off-topic.