I used donorbox to fundraise for a non profit running a school for refugee kids. We managed to raise £23k, on which donor box and Stripe (their banking partner) paid themselves a whopping a 6% fee.
Absolute disgrace - they essentially charge triple market price and refused to apply a lower pricing for non-profit.
This money was urgently needed by the school who is at risk of closing its doors, leaving hundreds of kids in the streets.
Just IMMORAL.