What Were They Thinking?
I suspect the tendency of leftists to trumpet the apparent tendency of some businesses to refuse to advertise on talk radio is based on two assumptions, one of which makes sense and the other of which doesn't.
The assumption that makes sense: There are now too many boycotters to start a counter-boycott. As long as it looked like it was merely Carbonite, it was easy to organize a counter-boycott. That's now a lot harder. It's easier to boycott GM than to boycott GM, Ford, Toyota, and Honda.
The assumption that doesn't make sense: Rush has been spanked by his supposed corporate masters and now must surrender. The belief that we wingnuts are following our corporate masters is one the most persistent beliefs on the left. When they encounter contrary evidence they will regard it as evidence of right-wing ignorance (warning: very rude language). It might be related to the belief that capitalism is merely the arbitrary will of capitalists.
Meanwhile, this looks like part of a continuing boycott of talk radio by businesses run by “pointy-haired bosses” instead of anything new. Question: Are they able to get away with it because Rush Limbaugh is in a time slot that is unlikely to be listened to by anybody with a job that requires concentration?