Most entertainment industries have very strong union presence.

Well, it happens that the company that has workers on strike at some point stops making money because of that.

The point isn't about what society cares about. The company loses its investment entirely unless they bargain with the union

Magic: the Gathering is the only profitable arm of Hasbro. I don't have the specific revenue numbers, but Arena is a huge part of the ecosystem. Sure, society at large wouldn't care, but letting the Arena release schedule slip behind the "paper cards" product would be a huge embarrassment within the community of customers and content creators that fuel the MTG machine. I would be shocked if they let it happen lightly.

I would be a lot less shocked if Hasbro sends in the Pinkertons to do some "persuasion" in the coming weeks and months:

https://www.dicebreaker.com/categories/trading-card-game/new...

What has unionizing and society caring have got to do with each other?