I've always wished there was a market for mod actions.

Moderation and centralization while typically aren't independent, aren't necessarily dependent. One can imagine viewing content with one set of moderation actions and another person viewing the same content with a different set of moderation actions.

We sort of have this in HN already with viewing flagged content. It's essentially using an empty set for mod actions.

I believe it's technically viable to syndicate of mod actions and possibly solves the mod.labor.prpbl, but whether it's a socially viable way to build a network is another question.

Consider the ActivityPub Fediverse. With notable, short-lived exceptions (when a bad actor shows up with a new technique), the majority of the abuse comes from a handful of instances, whose administrators are generally either negligent or complicit.