Vlad has addressed this several times; it’s a planned use case. They offer it because though they don’t keep logs they don’t expect everyone to trust that.

I can’t find the comment but he just addressed it a couple days ago here on HN.

Also, do you really think google doesn’t know who you are?

One would have to go to extraordinary lengths to hide your real name nowadays from even a talented curious searcher never mind google itself.

Even Ross Ulnricht couldn’t do it. And that boy had a LOT to lose.