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The only DRM which cannot presently be removed is Adobe's "hardened" DRM scheme. If Adobe had their way this would have been compulsorily implemented back in 2014, breaking compatibility with many devices. They were forced to back down and the result is that this system has never been widely implemented. Of course it can be by just changing a simple setting in the content server, which so far has not happened. When it does I expect that it won't be long before it too is understood and can be removed, though there are of course no guarantees.
In the meantime, Adobe continues to rake in the money from DRM which is easily circumvented by anyone who wants to take the trouble to do so. Does it serve any purpose? I imagine there must be some who try to do something forbidden by DRM, find they can't and leave it at that. Though there are also many who google and find their way to Apprentice Alf, or even, regrettably, Epubor. I have said in the past and still maintain that the best defence against piracy is reasonable prices and convenience. The miracle is that there is a thriving market for ebooks (and movies and music) despite the ineffectiveness of DRM.
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