Are guests allowed to participate in group DMs?

In Slack, guests are indeed allowed to participate in group direct messages (DMs), but their permissions are restricted in certain ways. Specifically, guests cannot initiate their own group DMs; they can only join or participate in existing group DMs created by regular members.

This means that while guests can contribute to conversations in group DMs and communicate with others, they do not have the ability to create new group DMs. This restriction is in place to maintain control over the communication channels and to ensure that guests have limited access to sensitive or internal discussions that might take place in newly formed groups.