I don’t think they would do that. That would be unbelievably stupid from a legal department. The funny thing with this sort of IP in most of Europe (though this could be different in Sweden but I really doubt it) is that nobody except the author can own it. All they can have is an exclusive license. If they are convinced of this and wanted to clear things up, they will sue. But they probably won’t because the guy is probably right.

> it’s actually irrelevant because no one bought the game because of the poem.

That’s a very wrong take. IP laws deal with copying and distributing works. You won’t get out of a lawsuit saying that it was not significant (unless you are pleading fair use, but it clearly was not the case here).

Whether the work is important or not does not matter before we talk about compensation. And then, an insignificant fraction of a few billions is still quite a bit of money.