And it seems like advertising is yet another industry (alongside payment processors, legal services, and real estate) that have managed to 'insert themselves' in the middle of all other commerce, skimming vastly outsized portions of profit off of the entire economy, by being intrinsically 'needed' to do business.
It seems to me that all of these things should be driven by competition to infinitesimal profit margins, because everyone needs them and there should be a big payoff in undercutting each other to take everyone else's business. In practice that's not true at all, which I think means that 'everyone else' severely lacks high-level bargaining power to force these industries down to reasonable cuts.
I fantasize about a scandal in which it emerges that click-through rates all lies and advertising barely actually works and the whole industry goes belly-up as a result.
... okay that's enough cynicism for today.