Well why are people up in arms about anything?
People are up in arms about things that don't even impact them because they're happening half a world away, just because they need a cause to be up in arms about.
Here you have a major hobby, a pleasant pastime, a source of fun and socialization (and other things) - i.e. gaming - that plays a significant part in the life of many people, and you have something that disrupts it, presents various barriers to enjoying different games, makes things less convenient. People can be up in arms even without a good reason, about things that don't even concern them, and this is a matter much closer to home for them, that directly impacts them, so the response is much stronger.