Bubble got bored.
You'd think he'd always have something to do, being responsible for the backend and all, and how finicky code can be. But you'd be wrong.
It was hard to find fun things to do. Caine was too busy tending to the players to make time for Bubble most days, and he'd have to resort to causing mischief to get his attention. Said attention was rarely pleasant.
So Bubble started eating.
He ate anything and everything. If it could go in his mouth and wasn't alive, he would try it. Even if it wasn't food. Even if it made Caine look at him with disgust and call him a freak. Even if it tasted bad.
Anything. Anything, just to experience something. To be doing something.
Maybe Bubble had a problem. If he were human, or at least a player, his habit would probably turn some heads at the very least. But he wasn't. So everyone just accepted the fact that this is just how Bubble was. Even Caine seemed to think that he had always been the disgusting weirdo who licks up people's vomit.
And besides! He still got his job done, so what was the harm? Caine can just spawn another bottle of shampoo.