Bitchat is an AOS (https://andotherstuff.org/#foundry-projects) project. Surprised, they didn't rehost it on ngit (https://gitworkshop.dev/), which is also an AOS project.
Nostr purity spirals have a great way of resulting in 5 people ever seeing what you're publishing. I love the protocol but when trying to get people using it you sort of need to put apps where they are.