The left of the @ is easy to change, and has no additional costs. The right side is a domain name, which would require the annual registration fee and paying for (or self-) hosting. Overall, it'd be a lot of work for one shitty joke.
I'm also scared of what will happen long term. In the beginning it's a joke and we all post innocent poop jokes but you know before long, Poe's law is gonna kick into effect and it's just gonna be some real weirdos left on there.