I think the base cause of this is that we look for products based on life events; if the light burns out, we search for a new lightbulb. Google can't have this

I think the base cause of this is that we look for products based on life events; if the light burns out, we search for a new lightbulb. Google can't have this data (thank Dog), so can only serve targeted ads based on recent internet activity. Thinking of this in terms of PID loops, there's too much external interference, and too much lag in the loop for it to be really effective in calculating the next derivative.