Dear Jay Shah,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, it seems that you are having concern if guests can view shared loop workspaces on their loop mobile app or web app.
We've done a quick test and guest user can access the shared Loop workspace in web app with the link shared in Outlook as shown below, window to switch account will prompt, and we can access the shared Loop workspace in web app when we signed in as a guest.
However, we cannot access the shared Loop workspace in Loop mobile app or Loop web app when we're signed in with the account that are not signed in as a guest as shown below:
Given this, we'd recommend you share your valuable feedback about this behavior in Loop Feedback Community, the Product Team is in-charge of the feedback site, and they are constantly checking the comments and feedback from our customer. Many features have been developed or improved based on users' comment.
If the understanding above is not consistent with yours, please feel free to post back and point that.
Sorry for the inconvenience again. Your patience and understanding are highly appreciated. Hope you stay safe and healthy.
Sincerely,
Rhoda | Microsoft Community Moderator