I think a good faith interpretation is that the "mistake" was having accepted the terms of use of Disney+. Not that it was really a mistake, the system is just rigged and they'd have found another argument if not this one.

It’s more interesting that, I’m assuming, they categorize mistakes by the nature of the error and not the results of the error. Not checking your blind spot on an empty road is a tiny mistake. Not checking your blind spot causing a bus driver to swerve to avoid a collision, but the swerve resulted in the bus crashing into a petrol truck leading to a massive fire and dozens of dead school children is not a tiny mistake.