Have you ever ran a business on donations?

As an indie app developer who bootstraps projects, sometimes I can't help but think that one day when savings are gone, I must find a way to sustain my digital business, and perhaps I should run it on donations. I'm working at Nomadful, a digital health company with a simple mission: to provide anyone holding a phone with free, high-quality mental health services. As of today, my mobile app has accompanied over a thousand people through their unique journeys with mental health.

Have you ever ran a business on donations? What have you done to support those who run on donations?

Thanks