I didn't realize how little Google does to anonymity the data. What is the point of dropping 1/4 of the IP address if you are tracking my identity permanently a

I didn't realize how little Google does to anonymity the data. What is the point of dropping 1/4 of the IP address if you are tracking my identity permanently across all IP addresses via cookies? I really feel like they've been misleading me this whole time about what they are doing. Not cool.