Democrats promised to rein in Big Tech. They have failed.

For 20 years, Congress has stood by and failed to regulate technology as tech has changed rapidly and become an integral part of Americans’ lives.

Democrats promised to change that in the last election cycle. While winning the presidency and both houses of Congress, they promised to crack down on the immense and growing power of Big Tech companies like Apple Inc. AAPL, +1.49%, Alphabet Inc. GOOGL, +2.60% GOOG, +2.62%, Amazon.com Inc. AMZN, +2.60% and Facebook parent Meta Platforms Inc. META, +3.38% by reshaping antitrust law.

With less than a...