No central server to setup or required, period.
Whether it's doing it on your own or sharing with 100 random strangers, you don't have to setup an account for them.
Yes, SVN can handle patching, so you could email those patches also, but it's based on client-server, so someone has to setup the server and add new accounts.
Googlers have used it internally a lot as a client when their central server wasn't that, even though git itself struggled with the scale, which is why they hadn't changed over to it exclusively even server-side. If it was that complex, why would they do that?