I don't love this ruling (and I probably disagree with it, but I haven't read the whole decision or the laws in question yet, and as an American, am not 100% clear on EU precedent so I'm somewhat withholding judgment), but yes, in most cases, anti-monopoly laws only apply when a company becomes large enough. In the US, it's actually explicit - monopolies can actually only exist if they are using their status to impact pricing/consumer choice, which necessitates size.