They have an unhelpfully generic answer to that in their FAQ: "After spending a significant amount of time researching potential umbrella organizations, we deci

They have an unhelpfully generic answer to that in their FAQ: "After spending a significant amount of time researching potential umbrella organizations, we decided that our best option was to incorporate an independent entity. Rust is a technology and community that is value driven and we simply didn’t find an organization that we felt was aligned with our community goals. This does mean more work for us, especially upfront, but we think the tradeoff is worth it." https://github.com/rust-lang/foundation-faq-2020/blob/main/FAQ.md#q-why-independent https://github.com/rust-lang/foundation-faq-2020/blob/main/F... As they are registering as a 501(c)6, I would assume that tax reasons would have impacting their decision not to join the SFC.