You only federate (content/communites) with stuff that’s been subscribed to by your users or vice versa.

So at some point in July some newcomer from reddit thought it might be a good idea to subscribe to lemmit.online, and then they returned to reddit, and we're stuck with this garbage in perpetuity?

I did read the authors FAQ. It's nonsensical.

All you have to do is block @bot@lemmit.online

That doesn't help new users. As I mentioned in my comment. This spam discourages engagement from new users and gives the impression that lemmy is some kind of shitty version of reddit. I guarantee there are many new users who don't understand why there are dozens of AITA posts from reddit with no comments.

you should convince your admin to defederate from lemmit.online

As I said in my comment, no one want's to defederate because someone will complain that it's censorship, which it is not in this case.

This way, I would still be able to access my beloved content without being beholden to Reddit’s mood swings and abusive relationship tendencies.

This is lunacy. He could have his own reddit without subjecting the rest of Lemmy to this spam. I sincerely doubt the guy is even using these posts himself - what's the point of reading AITA questions without the comments?!

Besides that, I also know that Content is King. [...] I figured it would be better to have some inorganic content to bootstrap the adoption of Lemmy.

It's the opposite, these posts are making it look like Lemmy has no content.