He's working on it, but it takes time. Finding a payment processor that allows the content that DS wants to make is difficult.
Hopefully soon he'll have his own site up and running so he isn't limited by Patreon.
Actually it isn't...There are literally MILLIONS (Maybe even Billions) of Porn sites who have all managed to accept payments for access to porn content without Paypal acceptance. And some of those sites features subject matter that includes Incest, Rape, Abuse and all these other very dark sexual subjects.
This idea of your that this is all about PayPal or that PayPal is the only way to collect subscriptions is just flat out wrong!
Even if it were difficult to get Paypal to give you an account based on the content you were offering it is easy as pie to set up a 3rd Party Reseller system who could take payments via Paypal and send the money onto the developer through other channels that Paypal would never know about.
Truth is Patreon may be the most popular place to find this type of content now...But it won't be for long if they keep banning projects from appearing on their site and censoring subject matter.
There ARE other sites out there developers could move to, Just because you have never heard of them or just because they don't have the BRAND NAME that Patreon has doesn't mean they are not a good alternative.
Because if enough Devs abandon Patreon for that new service that new service will become THE PLACE TO BE and Patreon will be just last weeks version of Myspace!