It doesn't really matter micro targeting is not effective.
Targeted ads pay loads more than untargeted, and you're essentially saying all those companies paying more are in the wrong. Some campaigns even manage 10-25% click through conversions, when well enough targeted.
You mean what the SEA people tell you? Yeah, we'll all probably be out of business tomorrow, if we don't run the whole Google stack.
https://www.linkedin.com/pulse/advertising-does-create-deman...