LE 8 custom update channels

Those are used, for example, by Milhouse builds, for switching back & forth to compare bugs or changes in test builds.
Not really useful in your typical household where a stable htpc environment is preferred.

Auto-update is supported by custom channels, but this is not a simple URL/page scrape and requires something server side, and most community builders do not provide/support the server side bit needed to use a custom channel.