I'm not sure at all what you're talking about at this point. The most relevant thing I can find with the abbreviation "sdf" is https://sdf.org/, but I don't understand what hypothetical version of that you're talking about where would be entirely contained within a Chrome instance.
sdf.org is the one. it’s a shared computing environment with thousands of users, mostly volunteer and donation based.
GP is stating that on such a system, static executables are expensive (and chrome is completely out of scope)