As with most things with AI, scale is exactly the issue. Harassing open source maintainers isn't new. I'd argue that Linus's tantrums where he personally insults individuals/ groups alike are just one of many such examples.

The interesting thing here is the scale. The AI didn't just say (quoting Linus here) "This is complete and utter garbage. It is so f---ing ugly that I can't even begin to describe it. This patch is shit. Please don't ever send me this crap again."[0] - the agent goes further, and researches previous code, other aspects of the person, and brings that into it, and it can do this all across numerous repos at once.

That's sort of what's scary. I'm sure in the past we've all said things we wish we could take back, but it's largely been a capability issue for arbitrary people to aggregate / research that. That's not the case anymore, and that's quite a scary thing.

[0] https://lkml.org/lkml/2019/10/9/1210

Great point.

Linus got angry which along with common sense probably limited the amount of effective effort going into his attack.

"AI" has no anger or common sense. And virtually no limit on the amount of effort in can put into an attack.