This would be really useful for us.
It would be great if one could set a private team as "visible" and then let other members "request to join".

So the content will stay private until the team-admin has approved the member willing to join.

This was already missing on Slack, even though it is a common feature on social media platforms, such as Facebook or LinkedIn.

If a team is supposed to be "invisible" for non-teammembers (as it is for now), then this option should be also available.

I hope you review the comments on this old post.