This is a good point to know about. I'm not too sure about how non-profits can be categorized in terms of "small" or "large", but typically when we are talking about SaaS costs, well that would depend on the number of seats or licenses. So for example, the Prevent Cancer Foundation might have millions of dollars in assets per year, they only have 26 employees[0], so in a way, they are a "small" nonprofit compared to others that might have hundreds of employees.
[0]: https://preventcancer.org/about-us/team/