No, they wouldn't shut them down. They'd open up the toolbox of administrative law to bleed them. We don't need to pass new laws. (that's what the line about "e

No, they wouldn't shut them down. They'd open up the toolbox of administrative law to bleed them. We don't need to pass new laws. (that's what the line about "enforcement" means.) The US Government can just barrage each noncompliant company with investigations, subpoenas, law suits, enforcement actions, national security letters, consent decrees and the like. They can find every issue or abuse of the platforms that no sane person would prosecute, then prosecute (or settle) them. They can sniff out (or manufacture) contradictions in depositions and pin charges of perjury, obstruction, or lying to law enforcement on individuals at the company. Given enough time, a concerted government effort to make life miserable for any of these companies would sap them of money, power, morale, and attention. (Their attention being valuable, the thing that keeps them competitive in the global marketplace.) This is a mirror image of the no-encryption-without-permission issue: administrative law allows the government to punish using process. You can't really run a company of any size except at the government's pleasure, because they can use administrative law to impose arduous costs and punishment through process.