The complaint here isn't that there is a contract; it's that the user is deceived by dark patterns into thinking they've entered a plan with no contract.

By contrast, going to tmobile.de or blau.de, even without speaking German it's extremely clear that prices are based on 24-month contracts. Never is the monthly price mentioned without a clear label below it indicating 24 month terms. Blau even takes it a step further and places the text twice in the box, once in the UI and another time directly below the price.