That’s not my worst one. I did an analysis for one company which took 2 months since their data was such a mess. They were spending at least $10m/year (20 high comp devs) developing a product that was pulling in 8k/year. They did not have a path to growing revenue 1000x on that one, when I told the ceo and he doubled down that it was a bet they wanted to make. They really just wanted the nice slide deck for the board.

I checked in a year later and they were still working on it. Two years later they mothballed it. They could have saved millions by listening to me.