According to IHE, Elsevier was offering people $25 gift cards for Amazon or Barnes and Noble if they would leave positive reviews of one of their textbooks on those sites. After the fake medical journal scandal, one doesn’t even have to ask. Clearly they have no shame. They only fake it when they’re found out. I wanted to write more on this, but it’s just so obviously disreputable there’s not much to say.  Of course they disavow responsibility. It’s always an overzealous employee. But overzealous employees are created by the corporate culture. I could probably retire on what the top two or three research libraries pay Elsevier each year, and I’m not that old.