I'm talking in the business sense here, but threats only matter if it's someone or something you care about. If the threat comes from someone who isn't a threat, it's not a threat. If you're in a different market altogether, let it slide.

It may sound like they are trying to gain dominance, but if it's in something you don't even care about, what does it matter?

They're only acting out of fear, or, more realistically, the illusion of fear.

Don't waste your time reacting to it. Focus on your own mission, and your own mission alone.