I don’t know why you are shocked and horrified when people engage with something on their own front page?
That’s how federation works, is it not?
It’s not brigading, it’s literally right there at the top of the front page, so of course people will comment on it.
Very good point-a way of connecting communities on Reddit that seems fairly innocuous but is actually a massive means of the “transmission” of users between communities, allowing users to find communities they like quicker and thus making them more likely to stay.
Very good point that I didn’t think of tbh.