Actually, they can count but they cheat. In the early days of our TechnologyBloopers website, we received an email from Google Analytics indicating that we had only 26 visitors during December 2017. But our hosting company Omnis tallied 2523. Why the difference? Might Google have been deliberately counting lower so they could sell us AdWords?
We become disappointed whenever we receive Google’s monthly Snapshots, and suspect that the large majority of website developers feel the same way. In December 2017 our server statistics showed nearly 100 times as many visitors as Google Analytics did, and in January 2018 they showed 60 times as many visitors as Google Analytics did.
Beyond disappointing we become angry when Google wants us to buy AdWords, implying that our visitor counts will be boosted.