AFAICT (from my charges) they have indeed been bundling charges. Charging the %+constant fee for each patron given that there is no individual payment-processor action for each patron on the debit side is absolutely nasty.
I'm not asking them to eat payment-processing fees, I'm not asking them not to make a profit, I'm simply asking them to not charge for fees for transactions that never happened.
I hope Hatreon (or any other patreon clone) steals half of their userbase because they absolutely deserve to be punished and chastised for this manipulative nonsense (along with their banning legal-but-NSFW content producers); because nothing else but people exiting from Patreon will make them feel anything.