- We eschewed VC funding. A big part of my motivation was that I felt that VC funding usually requires eventual enshittification. https://zulip.com/values/ talks more about this.
- Zulip has been 100% FOSS software for more than a decade.
- At the very beginning, we built a complete data import/export system that allows migrating between our Cloud hosting and self-hosting; we put a lot of care into maintaining it well.
I can't promise that we'll never have something to sell for self-hosting communities. For example, I could imagine offering a paid add-on for encrypted backups.
That said, I'd like to push back on the idea that charging businesses for a tool that's an important part of their daily work "breaks the seal". Organizations with a software budget should be happier to pay a fair price for ethical, user-first software from a friendly vendor than for a closed-source product from a megacorp. And Zulip's full-time development team should be able to make a living building ethical FOSS software.