How is a social security number relevant for a Patreon breach? Worst case, they would get your name, password, IP, billing address, subscription list, and, unlikely, your credit card info. I think this is what people are somewhat immune to.
For me, the password is unique, the name and billing address is public record, and my bank protects me from credit card fraud, since using one requires handing the number out multiple times a day. The only thing that bothers me is the IP address, but that was leaked in other breaches, once a few years ago, and twice this year. I think this is the same for most people.
You do have to put in your SSN at some point to get paid. It's stored with Stripe, but a hacker could prompt people to re-enter it for capture citing some issue. How many people are savvy enough to question that?
If you don’t care go ahead and post your social security number in this thread.