Earlier quoted context omitted.
The beauty of reddit is that you can create your own subreddit with your own mods and have the discourse that you want. You're not held to just sticking with the subreddits that are given to you.
What the parent is pointing out is that Reddit choosing subreddits for people to subscribe. Sure, I can "create the subreddit with [my] own mods and have the discourse that [I] want". But nobody will see it because everybody is automatically added to the subreddits that Reddit chooses.
No? That’s not how Reddit works, you join the subreddits you want to join