A federal judge has declared Google a monopoly due to its default search engine deals, prompting the Department of Justice to consider breaking up the company. The ruling has significant implications for other Big Tech companies, signaling increased scrutiny and potential antitrust actions. It is the most significant ruling since the Microsoft case in the 1990s and reflects the Biden administration's aggressive stance on regulating major tech firms. Google's loss is a boost for the Justice Department's ongoing efforts against Big Tech.