The companies are all major players in generative AI: OpenAI is the nonprofit startup behind ChatGPT, the blockbuster AI-powered chatbot. Microsoft, the world’s largest company by market capitalisation, has invested more than $13bn in OpenAI and holds a 49 percent stake in the company’s for-profit subsidiary.

Chipmaker Nvidia is a global leader in graphic processing units (GPU), a key piece of hardware needed in AI. The company recently hit a $3 trillion valuation, surpassing Apple to become the world’s second-largest company.

US authorities likely want to determine if the tech giants used anticompetitive means to dominate the burgeoning AI industry.

Under the terms of the deal, which was reported by multiple US media outlets, FTC will reportedly investigate Microsoft and Open AI, while the DOJ will probe Nvidia.

What is the US government going to be investigating?

US regulators – as well as observers outside the government – are concerned about the dominance of a handful of companies over the industry and whether it will edge out smaller competitors and startups with unfair business practices.

The US government has previously investigated Google’s monopoly over search engines and the dominance of Meta over social media in light of its ownership of Facebook, Instagram, and WhatsApp.

The cases are part of a major policy shift in the US over the past five years towards favouring more regulation after years and years of more pro-market attitudes, according to Dirk Auer, director of competition policy at the International Center for Law & Economics in Portland, Oregon.

“Enforcers both in the United States and in the European Union are very keen to bring cases in the generative AI space. The way they see it, this is the next big thing, and they think, rightly or wrongly, that they failed to bring competition cases in the early years of Web 2.0 and that led to more concentration in less competitive markets than would otherwise have been the case,” Auer told Al Jazeera.

Why are the investigations being split between two government agencies?

Both the FTC and the DOJ are responsible for enforcing federal antitrust laws.

The DOJ is a criminal enforcement agency while the FTC is a civil enforcement agency, but their work can overlap. Before launching an anti-trust investigation, the two agencies are required to notify each other, since they share responsibilities.

The two agencies worked together on a milestone case in 2019 against Facebook, Amazon, Apple, and Google parent company Alphabet that resulted in each of the tech firms being sued for allegedly violating anti-monopoly laws.

Experts say an investigation against Microsoft, Nvidia, and OpenAI could take a similar approach.

Why are they taking action now?

US antitrust lawyer Barry Bennett said that both enforcement agencies may be acting before the statute of limitations runs out or seeking to make progress in their inquiries well in advance of the US presidential election in November.

There may also be a “dawning sense that Congress lacks the cohesion and will to enact legislation that provides a regulatory alternative to litigation against firms that dominate the AI ecosystem,” Bennett told Al Jazeera.

In this climate, the FTC and DOJ have already been busy this year. The DOJ filed an antitrust lawsuit in March against Apple for monopolizing the US smartphone market, while the FTC is also separately investigating a $650m deal between Microsoft and Inflection, another AI startup.

Have these companies been expecting an investigation?

Neither Microsoft, OpenAI, nor Nvidia should be surprised when federal investigators come knocking.

In January, the FTC launched an inquiry into investments made by Microsoft, Amazon, and Alphabet – Google’s parent company –  into OpenAI and Anthropic, another generative AI company.

At the time, FTC Chair Lina M. Khan said the agency hopes to “shed light on whether investments and partnerships pursued by dominant companies risk distorting innovation and undermining fair competition.”

What could a lawsuit achieve?

The goal of an investigation would be to make the tech industry more competitive – something regulators have been credited with achieving in the past, according to Bennett.

The US government famously broke up telecom giant AT&T in 1984, and in 2001 won a landmark case against Microsoft over its monopoly in web browsers for the Windows operating system.

Bennett said these two cases “both released enormous creative potential and greatly improved innovation in the tech sector.”

Auer said, however, that he was not certain if a case against Nvidia, Microsoft and Open AI would stand up in court.

“There’s two basic problems with these AI cases. The first is that right now, the generative AI space seems very, very competitive and so that doesn’t make it an ideal target for antitrust intervention,” Auer said.

“The second big one is that these deals with big tech firms appear to be extremely valuable for generative AI startups,” Auer said, adding that more regulation would also mean financing and investment deals would take longer to receive approval, slowing down further research and innovation.