The problem with that is users need to make a separate account for each instance. Imagine if you had to re-login every time you wanted to view a different subreddit. It’s a major pain.
That problem could be mitigated if you had an app that could seamlessly log in to multiple instances and display the content in one place. Credentials would be stored locally on your phone for security. Do you know if that exists, or if anyone’s working on something similar?
You could say Reddit has Peak-ed. Now it’s time for some Digital Innovation. :)