an explainer just in case you're confused: in ActivityPub terms, C2S refers to "Clam-to-Shrimp" communication, and S2S refers to "Shrimp-to-Shrimp" communication
it is very important to note that no other sea life other than clams and shrimp are allowed to use ActivityPub. this is mandated by the specs. no really. go look them up
@kopper@not-brain.d.on-t.work