Big Tech companies thrive because consumers can't quit them

Big Tech's dominance within the social, political, and economic spheres of life is not going unnoticed; reining it in has become a bipartisan aim, even if for competing reasons.

Republican Sen. Josh Hawley of Missouri argues that Facebook and Twitter are censorious. Democratic Sen. Amy Klobuchar of Minnesota suggests that they are not censorious enough. In any case, both think Congress should do something.

Big Tech holds the keys to the kingdom of online life. Facebook, Google, Amazon, and Apple had a combined valuation of more than $5 trillion as...