At some point you have to trust your gut?
Speaking more broadly than FOSS:
The large national nonprofits probably don’t need your money, and the small local nonprofits probably do. At the same time nonprofit can lose sight of their mission, and bigger orgs need admin, specialty jobs, and leadership that are full time jobs that a family could live on. So it’s hard to generalize. Their mission is the goal, not making decisions based on finances.
I look at their finances to get an idea of where they are at. These can be “lagging indicators” if there really is a time sensitive need though.
Examples: Ran into one person who was trying to promote their non-profit rather than solicit donations — when I looked into their finances it was clear they didn’t have the money to get there but had done great work already. Another person who doesn’t pay himself for the work he puts in because it’s all volunteer based and only seeks contributions for his projects.
Also the Internet Archive? I always wish they crawled more of the web than they did in years past.
Salaries for key people aren’t out of this world given their scale and highest paid person taking a pay cut is a good sign: https://projects.propublica.org/nonprofits/organizations/943242767