> It did not work though. Bell and Standard Oil are notable examples. What else?
That's pretty unfair. IIRC, Standard Oil was on of the companies that was the impetus for antitrust law (and broken up by it), and AT&T was broken up (famously) in the 80s.
Basically, your "argument" is a troll or a deep and basic misunderstanding. Especially in the case of Standard Oil. You're basically saying the law doesn't work because it didn't work before it existed (Standard Oil became dominant in the 1870s or 1880s and the Sherman Antitrust act wasn't passed until 1890).