@brion @cscott I think the harassment question could go either way.
Someone who wanted to do automated monitoring of a wiki editor would probably find using RSS or Atom easier than using AS2 (sorry @jasnell).
Would someone who wanted to manually monitor a wiki editor rather use Mastodon for real-ish time updates, or an RSS reader? I'm not sure.
AP subscribers can be blocked. They could require approval, as with Mastodon. RSS subscribers are slightly harder to block.