It only makes sense if you consider that the end all be all to target your customer. Maybe late night television ads are even more effective than google searche

It only makes sense if you consider that the end all be all to target your customer. Maybe late night television ads are even more effective than google searches, because they are cheaper than prime time slots and are perhaps enriched for people with poor sleep. Maybe right now some subreddit is shilling mattress penny stocks and that is masking the true signal from your internet search data. You have no way of knowing that though, because you’ve reduced all of reality down to a single factor, an internet search, without considering how much of the observed variance could even be explained by this factor nor how the results might be confounded with other factors.