New delhi, Oct. 16 -- For much of their existence, the big four US tech giants-Amazon, Apple, Facebook and Google-have been viewed as scrappy startups. Consumers loved their products, regulators largely looked away, and competitors either got acquired or fell by the wayside. That run of good fortune has been under threat for a while, but 2020 may well mark the beginning of the end.

On Wednesday, US President Donald Trump called for a break up of the Big Tech firms after both Facebook and Twitter took the "editorial" call to downplay leaked, unverified allegations about rival presidential candidate Joe Biden. Last week, in a scathing indictment of the business practices of Big Tech companies, a US Congress committee led by Democrats compa...