Pretty much all forum works like that. The admin can delete whatever stuff they don't like. But at least in fediverse, you still have an option to start over in

Pretty much all forum works like that. The admin can delete whatever stuff they don't like. But at least in fediverse, you still have an option to start over in another instance instead of silently accepting your fate. If admins deleting your stuff is a concern for you, then you can just run your own instance, which is not possible on proprietary forums such as Reddit.