Technology that’s been around for years, which allows individuals to use services like apps and browser extensions to avoid seeing online advertising, has been causing new controversy in the past few weeks. According to Randall Rotherberg, president and CEO of the Interactive Advertising Bureau in the United States, the practice is “robbery, plain and simple.” Ad blocking is “a potentially existential threat to the industry,” he argued in a Sept. 22 opinion piece in Ad Age. “I wish I were crying wolf, but I'm not. Some websites, particularly those...