They wrote another article about how they went about building a $1M ARR open-source SaaS [1]. This details some of their approach to building the product in public as a form of marketing. The building in public approach works, if you already have a platform to stand on in my opinion. As someone who also has an open-source SaaS they're trying to market, I sometimes think if I should have also taken this approach, despite not having any reach at all.