This number was originally wired up directly to Sanctum functions, as well as Amarbot's brain; a fine-tuned GPT-J model trained on my chat history. Since this wiring was through Matrix it became cumbersome to have to use multiple Matrix bridges for various WhatsApp instances. I eventually decided use that model on my actual personal number instead, which left Amarbot's WhatsApp number free.
Whenever Amarbot responds on my behalf, there's a small disclaimer. This is to make it obvious to other people whether it's actually me responding or not, but also so when I retrain, I can filter out artificial messages from the training data.