Amazon.com is the latest to face possible sanctions over allegations it improperly withheld tens of thousands of business records—including some unflattering to founder Jeff Bezos—in defending against an action by the Federal Trade Commission.

At Google, a federal judge in San Francisco has ruled the company didn’t properly save evidence in a case brought by Epic Games, and its behavior has become a yoke as the Justice Department seeks to break up the search giant after winning two landmark antitrust cases.

A different federal judge recently referred the behavior of Apple to the Justice Department, in part because of alleged efforts to hide documents from legal scrutiny.

Such skulduggery gives new credence to complaints by rivals and regulators that these companies are often leaning into obfuscation as one of the tactics used to protect their kingdoms. In addition, their actions in court seemingly confirm what their many critics contend: that Big Tech needs to be reined in.

Apple, Google and Amazon have all argued in their individual legal battles that they have done nothing wrong. In Amazon’s instance, a judge hasn’t even ruled on the matter, and the FTC’s accusation comes on the heels of Apple’s rebuke.