This thread seems to have gone a bit off topic, but I'll respond to the original post:
Private Games was rolled out to staff shortly after Among Slimes as we planned for a partner release shortly after, including some work on a Bedrock implementation. Priorities on the infrastructure team have changed heavily over the past few months, and we haven't really had any time or resources to allocate to the project - releasing it to Java YouTubers was a five minute change, which is why we rolled it out a few weeks ago. The only reason the command exists on Bedrock is because of how our code works
behind the scenes.
I can't imagine us doing a full release (i.e, for regular players on Java and Bedrock) of the system in it's current state, it was coded in less than a week as part of our
game jam so as you can imagine the implementation of it isn't exactly the best it can be. We'd probably want to wait for a few other things we're working on internally to be complete before we start on reworking private games. Definitely still something we're interested in though!