> User data older than ~90 days is essentially worthless. For an average user, sure. But suppose the user suddenly becomes e.g. an important politician. Now ha

> User data older than ~90 days is essentially worthless. For an average user, sure. But suppose the user suddenly becomes e.g. an important politician. Now having their history older than 90 days is interesting. Hard disks are cheap, you can keep everything and wait for the ticket that wins the lottery. If you are a company like Google of Facebook, it is almost guaranteed that you will have juicy material about most people who become important in a few decades. In a few decades, any politician who says "anti-trust" will immediately have their porn history or edgy things they wrote as a teenager leaked to public.