The employer has more resources than the employee. Lawyers and private investigators would be a start. If I ran a company and found out my customers were sending death threats to my staff, I wouldn't care where it occurred and would throw a good amount of resources at finding out who they were, having them prosecuted, and then publicising the results as a sort of modern version of putting heads on spikes.

edit - though I would go to the person making the threats and give them the opportunity to make amends first before involving any level of publicity or authority.

Actually, it happens through various mediums gaming companies control, such as in-game communication, forums, and the like.

Companies can, and should, take vigorous legal action against customers who issue such threats. It would be a good start.

No offense, but did you read the article? It's about women who are harassed for working in the game industry, not playing games.

I agree with you, though, that game companies should generally take a hard line on abusive in-game behavior.

No offense, but I think you misread my comment, which did not specifically single out women gamers. Women who work at game companies receive threats through the channels I mentioned with some frequency, because they have access to them.