The SFWA has actually talked about this: when they made their books more accessible, they became easier to scrape.

“Our authors and readers have been asking for this for a long time,” president and publisher Tom Doherty explained at the time. “They’re a technically sophisticated bunch, and DRM is a constant annoyance to them. It prevents them from using legitimately-purchased e-books in perfectly legal ways, like moving them from one kind of e-reader to another.”

But DRM-free e-books that circulate online are easy for scrapers to ingest.

The SFWA submission suggests “Authors who have made their work available in forms free of restrictive technology such as DRM for the benefit of their readers may have especially been taken advantage of.”