An example site that takes user submissions and is not a wiki:

nerdydaytrips.org

github.com/nerdydaytrips/website

Users submit a form that is turned into a github PR, hosted with cloudflare worker. Site itself is completely static, made with hugo. The data about each map pin is simply key/value in the frontmatter of a markdown file:

github.com/…/1066-battle-of-hastings.md

Simple but effective and can be styled however you need (hugo has themes). Moderation can scale by adding more contributors who can merge PRs.