I'd read that the Hot feed degrades over time while a server is running, and this is responsible for users being shown several month or year old posts when browsing by hot. Some instances like lemmy.world get around this by restarting the server several times a day.
I was just curious about how often sh.itjust.works is restarted, since I've been seeing a high amount of old posts on hot recently.
Some have zero comments, but all the ones with comments have at least one from a few hours ago.
I wouldn't be surprised if the ones with 0 comments may have gotten new upvotes somehow, but I'm not sure how to check the upvote activity and history for ActivityPub