Absolutely nothing.
I joined lpsg back when dinosaurs roamed the earth, with the intention of making just a post or two. I tried several first names (not mine) to find one that was available. A couple of years later someone offered to buy the name from me (presumably in effect to take over my account) - I refused. I did give serious thought to changing it when I found I was making more use of lpsg than I had expected, but there's never a good time.
About when I joined I took a "stock" avatar that was on a lpsg thread (possibly not official, but the thread was hosted). I used it for years. Then someone pointed out that it was a detail from a photo on the web and lpsg asked me to stop using it. Okay, not a problem - but I feel I'm stuck with just my username for any sort of identity here.
Perhaps it's the ultimate anonymity - I don't feel "Jason" is me so I'm anonymous even from myself.