The Streisand effect is a phenomenon whereby an attempt to hide, remove, or censor a piece of information has the unintended consequence of publicizing the information more widely, usually facilitated by the Internet.
You get more bang for your buck by being banned. More column inches by causing offence.
It is an example of psychological reactance, wherein once people are aware that some information is being kept from them, their motivation to access and spread it is increased.
It is named after American entertainer Barbra Streisand, whose 2003 attempt to suppress photographs of her residence in Malibu, California, inadvertently drew further public attention to it.