https://www.bbc.com/news/articles/cpwwyj6v24xo.ampGaming giant Steam accused of ripping off 14m UK gamers
The owner of Steam - the largest digital distribution platform for PC games in the world - is being sued for £656m.
Valve Corporation is being accused of using its market dominance to overcharge 14 million people in the UK.
"Valve is rigging the market and taking advantage of UK gamers," said digital rights campaigner Vicki Shotbolt, who is bringing the case.
The claim - which has been filed at the Competition Appeal Tribunal, in London - accuses Valve of "shutting out" competition in the PC gaming market.
It says Valve "forces" game publishers to sign up to so-called price parity obligations, preventing titles being sold at cheaper prices on rival platforms.
Ms Shotbolt says this has enabled Steam to charge an "excessive commission of up to 30%", making UK consumers pay too much for purchasing PC games and add-on content.
The case is what is known as a collective action claim, which means that one person goes to court on behalf of a much larger group of people.
Ms Shotbolt - who accuses Valve of breaching UK competition law for at least six years - says she is bringing the claim "to stop this unlawful conduct and help people get back what they are owed."
