John Wanamaker, redux.
Supposedly John said, “Half the money I spend on advertising is wasted; the trouble is I don't know which half”.
I suspect that in 2019 that should be, “Half the money I spend on advertising is wasted; the trouble is I don't know which half... er, oh wait, yes I do. It's the online ads."
To be fair, I once knew a fellow who believed online ads conveyed useful information. He was weird in other ways, too. Credulous to a fault.
But like most here, I block ads and tracking, and don't use Microsoft's OS when I go online. When 90% of netizens run ad blockers, then the advertising industry will weep, and try to clean up their various pig-and-pony acts. Oddly, I don't see that happening. Most people seem content to spend lots of time on Facebook, but no time setting up decent security measures on their browsers. Alas, the world was ever thus.