This is literally contrary to what my correspondence with Patreon has been over the years. Also why did pornhub have to purge one of their most popular categories, which gave rise to the whole "step-" meme (before mastercard / visa rejected them entirely)?
This is pretty much a fact that mastercard / visa have their own set of rules to stop people using them for payment processing when producing content that they deem "brand damaging" or illegal in most countries (this obviously includes incest, bestiality, etc)
Here are a couple of articles here that may help:
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