I just wasted my time, again, because someone with a net "0" number of posts necro-posted in foo, and since I knew the answer (having just been through this with my kid), I replied to the question assuming it wasn't from 2010.
https://www.bikeforums.net/foo/64994...out-state.html
How about auto-locking threads with more than six months or a year of inactivity?
Maybe also a week (or longer) ban for a completely gratuitous necro-post.