Man, it’s been 7 years already (of ActivityPub).
Context: there were minor syntax errors in the examples, and ActivityPub was about to become a W3C Recommendation in a month or two, so I made a small commit, and mentioned it on the respective SocialWG IRC channel, but generally got a “sorry, we can’t really accept outside contributions…” response.
There still was a handful of other typos to be corrected, but since that was the policy—I didn’t bother poking at that further. At least there was a minor acknowledgment.