Nhost is an open source Firebase rival backed by GitHub's founders 5 years ago
No, it's a home-grown stack that I manage with Ansible.
I operate on word of mouth and haven't really put any effort into SEO or building an online presence because it's a side-project and I want to be selective about my customers (I have no desire to compete with companies like HostGator on price).
I own a couple of nHost domains in my local gTLD. Fun fact: I looked into buying nhost.io several years back but I decided it was too expensive at the time!
Best of luck with your project :)