nsfw: posts don't arrive filtered to activitypub users
posts marked nsfw (or other filtered terms) published from hubzilla arrive on activitypub unfiltered, as regular posts.
hubzilla post on hubzilla server
hubzilla post published to activitypub server
the other way around, however, works: activitypub posts marked nsfw/cw show up with clickable links on hubzilla servers.
cw filter setting on activitypub
cw post on activitypub server (note the "show less" link)
cw post filtered on hubzilla server (note the "view article" link)
cw post open on hubzilla server (note the "view summary" link)
ideally, behavior would match in both directions. as is, there is no way to send nsfw posts to activitypub users suitably filtered.