Another poster has pointed to a statement by Mark Zuckerberg that they will release soon Muse Spark as open weights. While I agree with you for the Muse Spark

Another poster has pointed to a statement by Mark Zuckerberg that they will release soon Muse Spark as open weights. While I agree with you for the Muse Spark as hosted by Meta, if it will be available in open weights form for self hosting, then there are good chances that it can become quite useful.