Yeah, I completely agree, but the OP is speculation too, because it's from Scott Myers's reading of a blog post. If you go read his linked blog post (from Laura Baldwin, President of O'Reilly media) you can see they explain many different aspects of their decision. Not once do they mention DRM in a negative way (only apologizing for no longer offering it in multiple formats via their store). In fact, they mention explicitly that Google will still publish their content DRM free.
The reasons they give for discontinuing their e-commerce efforts are that book sales have been dwindling since 2000, and that they simply make too much money on new interactive media and don't want to pay for their own e-commerce infrastructure and staff anymore. I would imagine the publishers they are now relying on can also help them market their titles (which I suggest speculatively would help significantly).
The article I want to link from Laura Baldwin is unfortunately only directly linkable via social media, but for now it's the only article at this link:
https://www.linkedin.com/pulse/oreilly-mission-spreading-kno...
Anectdotally, I bought a lot of DRM free books from O'Reilly directly. While I did share them due to convenience (coworker doesn't understand SSL! No problem), I also shared them with friends who couldn't afford them. I think this was actually good for O'Reilly, and that Tim was right and still is on this score.
I say this because I personally spent many thousands of dollars through their web store. My friends without cash who went on to become computer professionals started paying for the new books they wanted as well. The vast majority of people I shared books with who could afford them would go out and buy several more after seeing the quality and value of particular titles.
It's obviously a culture and economic mechanism that subsidizes certain kinds of customers and use, but I believe it subsidized the "right things". Because much of the content builds value in real marketable skills, free-riders can eventually become wealthy enough that the price to convenience ratio tips correctly and they become paying customers. It helps that they now have very strong brand loyalty. This is how I became an O'Reilly customer in the first place, so many year ago.
O'Reilly direct e-book sales was a positive example of business that creates huge uncaptured value for the domain (technical knowledge), but by virtue of that generates more customers. This is the kind of business we actually need. In some ways I think it was their own success that killed their book business, because ultimately digital books were replaced by more compelling media formats, and those exist largely due to advances in design and technology, and their books are raw fuel for those advances.
I say this many words only because I loved them so much, and am sad to see them go. I have to sadly admit it's been probably two years since I either read or bought a lot of titles from them. I haven't been reading or buying technical books at all. I don't know if this says something about my current level of specialization, perhaps my current level of laziness, my subconscious desire for new media formats, the quality of the titles they've been publishing, their business model, or perhaps the nature of the industry they serve.
I'd personally like to hear more from O'Reilly about this eventually. I know they need to spin everything to look good, but I am incredibly curious if their non-book media is actually increasingly popular as they suggest. Do people just not want technical books anymore? Do people want them but increasingly pirate them and never pay? Are people willing to pay for technical knowledge in different media? Did their business model cost them their business, or is this the result of unavoidable change in the market for technical knowledge?