What does it mean if an #ActivityPub message contains a type: Place with lat/lon coordinates and an accuracy attribute of 94.5 as per the spec example? There's a 5.5% probability that the location is wrong? Just a bit off, or completely, wrong-planet off? Perhaps the object is not a Place at all? https://www.w3.org/TR/activitystreams-vocabulary/#dfn-accuracy
A Place is not described as, nor does irs naming imply, a Coordinate. A Place could be as large as a football field, shopping malli, university campus, or a city. That has implications to what radius could mean - it's not necessary an error estimate.