> What you have described here is exactly how all websites work
Not within the platform, no.
It is easy to create another subreddit. And if you create another subreddit, you have full access to all the same Reddit infrastructure as every other redditor.
I am talking about access to the platform.
> Except you change a few more characters
No, you would not have access to all the Reddit infrastructure, and access to all the cross site stuff, using the same Reddit account.
It is pretty easy to move across Reddit, and within Reddit, and get all the advantages of it. You don't get all those advantages, if it is another website.
Other people can't use, for example, the same mobile Reddit app, to access your website, and would have to download a new app.
They can't log in using the same account. They can't keep track of their posting history, all through the same user link.
There are numerous examples like that. There are lots and lots of benefits to using the actual Reddit website, compared to using a different website.
So no, you cannot just create a new website, and get all of the very significant benefits that you would get, from having it all on Reddit, using the same infrastructure, and account, and mobile app, and posting history, and follower list, ect,ect ect, for example.