it's not piracy, that's for sure. EA is not losing any money when you play a game offline that they shut down.
abandonware is software that is ignored by its manufacturer, and is no longer being supported. the property still may be under copyright but they're not enforcing it on the product.
if you're afraid of prosecution, don't be. if you're afraid of making a topic on here, don't worry, you'll be fine. it's not a private server, it's not piracy, it's abandonware.