My spreadsheet says the total cut of my take that goes to Patreon and payment processing is about 10-15%, but I am an Early Adopter who gets a much better deal from them. For someone like this dude who doesn’t have this deal and has their usurious international fees on top of it, it’s definitely a bad choice.
Patreon did one big thing: they took the concept of “monthly donations to support the arts” and repackaged it in a way that took off. I never got support via the old PayPal donation button like I have via Patreon.