Something to keep in mind is that just because a community hasn’t been active recently doesn’t mean it’s completely dead. As long as it has subscribers, new posts will show up on their front pages and get votes and comments, even if it’s been weeks since the last post.
It’s a fine idea but feels like it’s maybe past its prime in terms of active maintenance? Like I checked out my old neighborhood in the suburbs of a large US city and the primary road through it (which the area is named after and has a very big visible welcome sign indicating that) was misspelled. I don’t have an account and didn’t care to learn how to edit it, but I did drop a note flagging the error. Then I browsed some of the other notes and noticed they were all multiple years old. Even Manhattan was littered with months- or years-old notes with only a handful of them marked resolved. Maybe they were just hard edge cases not easily fixed, but it gave the impression of a database that has not been broadly maintained for years.