I don't buy it for one simple reason. If they have so much data to target. Why is there targeting so shitty and ad quality so low? If they had so much data, why

I don't buy it for one simple reason. If they have so much data to target. Why is there targeting so shitty and ad quality so low? If they had so much data, why not do something useful with it besides low quality ads? I don't subscribe to them listening either to be clear