>>1443
>>1445
It really isn't.
You are allocated a user ID, which stores a lot of information(post history), since its based on p2p and like a torrent everyone is sharing the data of the site with everyone, but its possible to change your User ID.
This makes it even possible to have several IDs and change between old and new ones to do different things.
There are also options which allow you to chose, which boards are you seeding and there are options to blacklist other users and sites, so that you don't download their data.