I would argue Patreon is far more parasitic than Apple in this case, they're shaving off 10% for a pretty simple service.
I think it's reasonable to say Patreon shouldn't take 10%, but you can't ring up Visa and get a regular 2-3% rate from them for something like Patreon, most likely, due to things like brand risk, chargeback rates, etc.
Then there's all the administrative overhead involved in disbursing payments to creators from all sorts of different legal jurisdictions and reporting information to the right government agencies. I can easily imagine the operating costs of Patreon being something like 7-8% of the money they handle.
I haven't seen anyone in this particular thread calling for Apple's cut to be 0%. I do think they could afford that, but a common refrain is that Epic's rate of 12% would be sustainable, and I agree with that. It's also the case that Apple moved to a gradual rate system where low-income developers only pay 15%, which kind of proves that they don't actually need 30%, they just want 30%.
This is the triple-dip attempt.
As far as I can tell it wasn't even raised in the Epic case either.
No one thinks Apple shouldn't be allowed to make a buck. No one thinks Patreon shouldn't be allowed to make a buck.
But Patreon's fees are near-universally held to be reasonable and fair, and Apple's are some bullshit.