I&#x27;ve been running ad campaigns for about 10 years. The market seems to have done a fairly good job of balancing out inventory costs. If a publishers hammers their audience with ads they lose them. In the short term, people throw up their hands, but eventually those users move to greener pastures. There is a damn good reason the most dominant parties in advertising - Google and Facebook - have the tiniest, and most targeted, ads.<p>There has yet to be a point at any time in the past decade where I said, this doesn&#x27;t work, and shut all of the ad campaigns off. There definitely are issues that exist. There is a problem with mobile app ad quality. There definitely are bot traffic problems. The ad exchanges will be pretty brutal on inexperienced advertisers, but this was the case pre-exchange too. One &quot;bubble&quot; point is I suspect many of the adtech companies involved in exchange inventory may fine themselves on the line for the bot traffic. It will be enough to wipe out the investor equity. This follows based on class actions Google, Yahoo, and others have had to settle in the past and Google especially has always been aggressive about this stuff (although less so in the past two years.)<p>I read the original blog post and the writer doesn&#x27;t seem to make a very good case outside of things that happen in normal capitalism. Lots of middle men, tools, and supply chains attempting to add value along with investors dumping in a ton of money in an attempt to gain some return -- possibly more than they will ever get back out. Sounds like a healthy marketplace to me. Some ideas are terrible, some are good, some are amazing but will never return their investment. That is ok.<p>The bigger problem is for small publishers and likely medium sized ones too. Ad inventory and the users online has ballooned many times over over the past decade. It also is a problem for traditional media companies like radio stations, newspapers, and television channels. I don&#x27;t need to extrapolate on that one.<p>Advertisers need to be sophisticated. They had to in the past too but few had access to tools that told them they sucked. I&#x27;m not sure that is any more extraordinary than asking a commodity traders purchasing cocoa beans to know what they are looking at and know how to be sure that is really what shows up at port.