They didn’t react because of Helldivers 2, it’s because of their upcoming PlayStation to PC ports, who will feature enforced PSN linkage and they now noticed, “oh fuck, so many people won’t like it and this will cost us sales”, right now only Helldivers player were angry and boycotting, soon it will be every possible Steam customer, who has to decided pro or against getting a mandatory PSN account, for stuff like Ghost of Tsushima and more.