Because there is no database query and no server work per visit, a static page is fast everywhere, cheap to host, and hard to take down. Modern frameworks such as Next.js generate the pages at build time and rebuild when content changes.
It suits marketing sites, documentation, blogs and catalogues with periodic updates. It does not suit a page that must show live per user data, which is what server rendering or client side fetching is for. This site is static throughout, which is why its first byte is under half a second.