If people actually read the claims... it's about fair business practices, this is why they are suing Sony:

> ... In the EU, it is forbidden for large companies to abuse their position to make more profit at the expense of consumers. Yet Sony does not fully abide by these rules. > > If you buy a digital game or in-game content, Sony will only ensure that you can do so through its own PlayStation Store. Sony keeps the market to itself in this way and can keep prices artificially high. This way you pay more, without getting anything extra in return. This is called the “Sony Tax.”

This is not a lawsuit about Sony "taking away my discs", it's something like "Sony allegedly used its control over the PlayStation ecosystem to restrict competition in digital distribution, allowing it to keep prices artificially high and harm consumers".