THREE-QUARTERS of Americans admit that they search the web, send e-mails and check their social-media accounts in the bathroom. That is not the only connection between tech and plumbing. The water and sewage industry offers clues to the vexed question of how to regulate the Silicon Valley "platform" firms, such as Alphabet, Amazon and Facebook. The implications are mildly terrifying for the companies, so any tech tycoons reading this column might want to secure a spare pair of trousers.
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