This article resonates with me so much. I recently purchased an e-Book on Wiley too. Atleast, the author got an EPUB with DRM in it, which is pretty easy to remove using de-DRM tools (open source). However, what I got from my purchase from Wiley was some stupid proprietary format that requires me to install some crapware called Vitalsource. There is nothing out there that will de-DRM for you and you are forced to install this crapware wherever you intend to read this - be it on your mobile or desktop. I thought ok, no biggie, let me seek a refund ASAP, but Wiley explicitly disallows refunds, probably this is the reason.
In their entire website, they refer to these things as "E-Books", but it is anything but. It's a proprietary viewer. There is a small "i" icon next to them in the listings, which I presume they must have added recently that now states these things aren't actually E-Books (in fine print). Clever huh?
Either way, I don't understand the point of DRM. People can still make copies if they're determined to, and studies have shown that giving away ebooks actually increases sales. If these sort of publishers go bankrupt, no one will shed a tear. Because, you know, don't fuck your customer maybe?