Elon Musk, the world’s richest man, is spending $44 billion to acquire Twitter with the stated aim of turning it into a haven for “free speech.” There’s just one problem: The social platform has been down this road before, and it didn’t end well.A decade ago, a Twitter executive dubbed the company “the free speech wing of the free speech party” to underscore its commitment to untrammeled freedom of expression.Subsequent events put that moniker to the test, as repressive regimes …