Hosted as in self-hosted, as in run on a server with Docker/Proxmox/Unraid and accessible via a web browser, as opposed to running locally on a single device.

The solution isn't ideal for those who hoard entire romsets, but it's great for those of us who curate their collections down to a more manageable size. That can be anywhere from a couple hundred to a couple thousand games, and the metadata sources are fairly robust at that scale.