Source?

I don't think it's true. For 2020, >75% come from individuals; corporate is only a tiny fraction:

https://www.eff.org/files/annual-report/2020/index.html

That's fair.

I think the part of the point about the EFF's political position still stands, my understanding was they're VERY big tech aligned.

That is a bit of my feeling too, funding aside. Often it appears that they are slapping Big Tech on the wrist. Still do great work in general though, just nitpicking since we're on the topic.