Mostly donations [1]. The yearly budget is around $30M, which is a lot but pretty tiny for an app so many people use. They only have around 40 employees [2]. P

Mostly donations [1]. The yearly budget is around $30M, which is a lot but pretty tiny for an app so many people use. They only have around 40 employees [2]. Personally I think the small staff, donation-based funding, and security-focused security constraints are a plus: the platform seems way more stable than most and does what it needs to do. [1]: https://projects.propublica.org/nonprofits/organizations/824506840 https://projects.propublica.org/nonprofits/organizations/824... [2]: https://en.wikipedia.org/wiki/Signal_Foundation https://en.wikipedia.org/wiki/Signal_Foundation