The link below is to an article that takes a look at what is currently available in the ebook subscription space now that Oyster and Entitle have closed shop.
I have a ‘membership’ with Smashwords – why? I don’t know. I never use them anymore and barely ever did. The link below is to an article which really sums up my view of Smashwords as it covers the partnership between Overdrive and Smashwords.