Not sure I see an answer about Foot=Permissive streets. In “Elmbridge” (which I have just got to 100% yeah!) there are quite a way “gated” estates. Not surprisingly these are marked as private on OSM and so generally do not have nodes on CS (apart from a few which marked as open access to all - by mistake which have corrected on OSM). Indeed some of these are always behind a locked gate - especially dead ends and clearly pricate. However there also quite a few “normal” streets where there is no permanent way to stop people entering and there always seems plenty of walkers and indeed runners making use of these streets - some of which actually allow you get “somewhere” as opposed to having to exit where you entered.
From some research I am starting to think that it might be prudent (and possible more accurate) to mark at least the ones that actually connect different entrances as foot=permissive on OSM. Would that actually technically allow them to appear in CS or is it only Foot=Yes ones that count?
Yesterday I covered almost 10K “ticking off” some of these streets in to at least look my Heat Map look more complete. They are ones to the south in my run yesterday where I did the one street I had left in Elmbridge. https://citystrides.com/activities/14849073 A half marathon for one street is a bit of a poor return