Ah please, it's just a specifically egregiously example that I'm guessing most fediverse users would know about. The problem is hardly limited to discord, you can find similar activity on Instagram for example.
Parents
Yes, but also the kids who are being groomed are more often than not already in a vulnerable situation. Given that you are indeed familiar with the discord situation I don't need to explain this any further I hope.
Awareness
I'm not sure I'm following, awareness by who? Kids who want attention? Groomers looking for kids to manipulate? The absent parents?
Moderation
Might help, but how do you enforce a moderator? Just look at R*ddit where spez himself moderated a jailbait sub.
Greed
Now this here I'll agree would help, but it still doesn't prevent those who are actively grooming from getting what they want.