Earlier quoted context omitted.
The costs? Are you joking? Of to the 2 Billion people using Chrome, point out just one for whom the privacy implications around autocomplete have imposed a non-theoretical cost. There's the cost you impose on yourself for paranoia, but lay THAT at the feet of the FSF. And if you say bandwidth you're fired. It's privacy the FSF is grumbling about. And for that it's been rhetoric and theoretical suffering, but no actua…
If your browsing history is of value, than giving it (or even just the portions of it that are manually typed into the url bar) away is a cost to you. You can't point to a dollar amount on an invoice, so in that sense it's not "non-theoretical." But if you believe that personal information can be valuable -- and it's pretty clear that it can, especially in the aggregate -- then calling this a "cost" is not a joke.
At the end of the day, serverside autocomplete is useful, and coal is cheap!