

It has nothing to do with advertising. The phrase refers to bias and stereotyping. It is not about the book, it is about the person doing unfair judgment based on superficiality instead of knowledge.
There are no covers that are not carefully chosen for the book they accompany. The source of error lies on the beholder making false assumptions about what the book is, then passing judgment on said book they haven’t read based on limited information and most likely incorrect assumptions.
The phrase calls people to check themselves and their own biases before making decisions with limited information. Or at least to search for some more data with curiosity instead of bias.



Lots of questions posted here are not genuine questions. Instead they are socio political comments trying to manufacture gotcha replies for controversy.
Those are not stupid questions, they’re rethorical questions. They are not what the community is for.
“No stupid questions” means that genuine good faith seek of knowledge or dispelling basic ignorance will not be shamed. Political rethorics will be shamed though. Thoroughly downvoted and mocked.