It definitely gets used as a tool to get attention, but let’s be real, nobody is getting rich selling cheap paperbacks in 2026. If you’ve ever been around a school district targeted by the moms for liberty or whatever, it’s a very real thing.
When I was growing up in the early 90s, a local crazy preacher guy got a bunch of people riled up and angry about Goosebumps, Huckleberry Finn and to Kill a Mockingbird. These were the same types of folks playing metal music backwards to find satanic instructions.
It was a simpler time without the internet to keep stupid people riled up for extended periods. Now idiocy is a social movement.
To be fair to the folks playing metal backwards, some 80s bands did include backward encoded messages about satan. It was likely publicity stunts to rile people up though. Include something controversial for marketing.