Literally anything that passes through Mastercard/Visa is unsafe (which makes sense considering their ties to anti-pornographic propaganda groups/hardcore evangelists). Look at even dlsite now, if a site uses them it's a matter of when not if.
Anyway there's 0 point dooming over this or over-speculating preemtively, what'll happen will happen.
Patreon page is up again for now! (Should be added to the main page again).
Currently there is no reason given why it was deleted by patreon according to Shaso.