Agree with you.
"In the context of the OnMembersAddedAsync method, the membersAdded list contains information about the members who have just been added to a conversation. Here's how this iteration process works:
Method Parameters:
membersAdded: This is a list of ChannelAccount objects, each of which represents a member who has just been added to the conversation. ChannelAccount objects contain information about the member, such as their Id, Name, Role, and so on.
turnContext: The current context of the conversation and activity.
cancellationToken: A cancellation token, which can be used to cancel the request if necessary.
Iterating through Added Members: The code block starts with an iteration through the membersAdded list. This iteration is performed using a foreach loop. For each member in the list, the code within the loop will be executed." (ChatGPT)