Check whether a user id (or external user id) identifies a system user —
a service bot such as a recorder, streamer, or transcriber (prefix match,
case-insensitive), or a paired secondary-camera join (a "ghost camera":
a device an already-present participant paired as an extra video feed,
identified by the ghost-camera naming convention).
Check whether a user id (or external user id) identifies a system user — a service bot such as a recorder, streamer, or transcriber (prefix match, case-insensitive), or a paired secondary-camera join (a "ghost camera": a device an already-present participant paired as an extra video feed, identified by the ghost-camera naming convention).