Not having to pay Adobe for each ebook sold is probably a sensible thing. For Amazon, having its own ebook format there is no advantage in Adobe's DRM. Compatibility is only useful for the whole package: file format + DRM. For Apple it is different as they use ePub. If they would use Adobe's DRM, their ebooks would be compatible with other publishers and ereaders. But maybe they don't want that, as they want to sell iPads.
That said, DRM keeps being evil, and certainly if it is controlled by one company. (Can you say `monopoly'?)
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