Huh, it's true. I thought an organization that needs $50M yearly to function[1] would employ more people. Still, I think it's fair to call them "pretty big" looking on how much media exposure they get or their operating costs. Perhaps a bit misleading from my part with the "company" part, as I'm not english-native, every type of firm,company,foundation in my head translates to a "company", sorry about that, will be more clear next time :)
No worries, I don't think "company" is even technically wrong. But I do think given the nonprofit structure (and Moxie Marlinspike's track record), that there are fewer incentives for Signal to lie about its privacy guarantees than a messaging app backed by a commercially-driven big company.
Or a medium-sized (~50 employee) nonprofit, anyway.