The EU has announced investigations into some of the biggest tech firms in the world over uncompetitive practices.

Alphabet, which owns Google, Meta, and Apple are all being looked into for potential breaches of the Digital Markets Act (DMA) introduced in 2022.

If they are found to have broken the rules, the firms can face huge fines of up to 10% of their annual turnover.

EU antitrust boss Margrethe Vestager and industry head Thierry Breton announced the investigations on Monday.

It comes three weeks after the EU fined Apple £1.5 billion for breaking competition laws over music streaming.

Just six companies have obligations under the DMA, but they are also the world’s largest tech firms: Alphabet, Apple, Meta, Amazon, Microsoft and ByteDance.

None of the firms are actually based in Europe – five of them are in the US, while ByteDance has headquarters in Beijing.

Three of them are now facing questions just two weeks after submitting their compliance reports, which will have been meticulously compiled.

Meanwhile, the United States accused Apple of monopolising the smartphone market in a landmark lawsuit against the tech giant introduced last week.

In its investigation announced today, the EU says it believes Apple and Alphabet are limiting anti-steering.

This means they are making it difficult for apps to tell users about ways to pay less for their services outside of using app stores’ own payment methods.