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Well, they also are pretty terrifying to Moose too.

Killer whales (Orcinus orca) are the moose's only known marine predator as they have been known to prey on moose swimming between islands https://en.wikipedia.org/wiki/Moose

Neat! And I'd imagine any other target of opportunity that swims between islands in same waters - i.e. deer, bear.

The relationship is also largely reciprocal. Humans are terrifying land creatures, but don't often attack Orcas.

There are interesting stories of human/orca cooperation, even. This one even comes with photographic and physical evidence:

https://en.wikipedia.org/wiki/Killer_whales_of_Eden,_New_Sou...

Orcas knows what food they like. We're not on the list.

They’ve been attacking boats in the Gibraltar region recently, though.

I think more accurately motors of motorboats.

They have been attacking the rudders of sailboats.