A US company called Blackbaud own the Justgiving brand.
They do get fees per transaction and despite public uproar, they do get support for this from many charity organisations who use them.
Hi...the organisations listed are funders they issue grants to charities from the funds raised, I think it is aimed at the charity sectors struggling to deliver services not necessarily the NHS. I am a supplier to charities and gleaned this from the Facebook groups I reluctantly joined. Hope...