Teaching with Moodle

I don't see the requirement to create separate topics for each user
Without actually trying it, so more than happy for anyone to correct me, but I think what you would have to do is
1. make sure permissions to view participants lists are removed so users can't see each other (you'd only have to do this once)
2. Add each user to their own group - in the course Groups settings there is an option to auto create groups which can be done by number of users in a group, set that to 1. If you get new users in later you may have to redo that, or add indivuals to their own group manually.
3. create your course with all resources and activities
3a. resources such as labels, files, pages, etc do not need to be restricted, they are the same for everyone - if you need to personalise the content, consider using a plugin such as Generico which allows you to create content using variables such as user names
3b. activities can be set with groups as Separate Groups, so that each group can only see their own content on the activity. Create each activity once and set the group mode. There's no need to duplicate the activity (or whole topic section) for each user.

I believe that's it. No need for multiple topics. You can use the access restrictions as well if some content needs to be further restricted, but making use of the separate groups feature should enable what your original post asked about.

Richard