For two months, Google has been involved in a high-stakes antitrust case in Washington, where they are accused of abusing their dominant position in online search and advertising. This case could have a significant impact on the world’s most popular search engine. Now, Google is facing another legal challenge closer to home.

On Monday, Epic Games, the company behind Fortnite, will begin a monthlong trial in San Francisco for their own antitrust lawsuit against Google. Epic alleges that Google is violating state and federal antitrust laws, as well as its own founding principle of “Don’t be evil.” The lawsuit claims that Google is exerting monopolistic power over app developers on its Google Play Store for Android phones.

Epic’s complaint states, “Google has relegated its motto to nearly an afterthought, and is using its size to do evil upon competitors, innovators, customers, and users in a slew of markets it has grown to monopolize.” The company tried to bypass the Play Store’s fees by allowing Fortnite players to pay Epic directly for in-app items, which resulted in Google removing the game from the store.

If Epic prevails in the lawsuit, Google may be required to modify its Play Store rules, allowing other companies to offer competing app stores and making it easier for developers to avoid the fees Google collects from in-app purchases. Currently, Google charges a 15 percent fee for customer payments for app subscriptions and 30 percent for in-app purchases. Epic and other larger app makers are subject to the 30 percent fee.

These simultaneous antitrust suits highlight how Google is simultaneously defending against multiple challenges to its influence over the internet. These lawsuits are part of a broader effort by tech regulators to curb the power of Big Tech companies. For Google, these legal battles are distractions from its competition with Microsoft, OpenAI, and others in the field of generative artificial intelligence.

Paul Swanson, an antitrust lawyer, suggests that Google faces significant risks with the number of cases it is currently involved in. He states, “At some point with this many cases, one breaks against you.”

However, Epic faces an uphill battle in their lawsuit. They previously sued Apple with similar claims, but most of their arguments were rejected by a federal judge. In the current trial against Google, Epic believes they have a better chance of success. This trial will be decided by a jury rather than a judge, and Epic will present evidence that they believe proves Google’s misconduct, including claims that Google forced phone makers to pre-install and promote its apps and paid off developers to use its payment system.

According to Mr. Swanson, a jury trial could work in Epic’s favor. He suggests that jury members, who are normal individuals, may assess Google’s behavior differently than judges who evaluate it through the lens of antitrust jurisprudence.

Aside from the ongoing legal battles, Google’s CEO Sundar Pichai and Epic’s CEO Tim Sweeney are expected to testify in the trial. Mr. Pichai recently testified in the Justice Department’s antitrust suit against Google’s search engine. The department, along with many state attorneys general, accuses Google of anti-competitive practices. Google argues that it obtained default positions because it has a superior product.

In addition to these cases, Google is also facing a separate antitrust lawsuit over its ad technology. A trial for that case could begin next year. It is clear that the outcome of these legal challenges will have a significant impact on Google’s operations and business model.

David McCabe contributed reporting from Washington.