Yeah, I definitely miss the days of peinto.org and stuff. I personally can't even bring myself to draw pseudoanonymously, because I don't like the commitment of owning an account. Art is such an ego thing, people really adore the idea of owning the things they make.
But it's somewhat necessary. For example, I could release something under CC-BY copyleft or copycenter. Arguably, that permits more freedom than public domain under anonymity. In a practical sense, copyleft ensures much of the intended effects of public domain with much greater efficacy in a society where social media like YouTube and DeviantArt steals your copyright without explicit consent and DMCA has no repercussions.
It might be construed as vanity to maintain an identy in the form of copyright, but, with copyleft, it can also be an ethical decision that's to the benefit of others. In protecting yourself, you protect the people who redistribute your media and make derivatives from being the target of unjust DMCA's.