I don't use gmail anymore and have a google account not linked to my personal identify for this reason. For one company to have your emails and internet search history as well as location data is just too open to the possibility of abuse, and with the increasing erosion of basic civil liberties under the conservative government you want the state and private corporations alike to have as little data on your internet activities as possible, lest you get charged with "hate speech" for insulting someone on reddit. Decentralising the storage of your personal data is definitely a good thing.