The European Competition Commission's Margrethe Vestager has tech CEOs quaking in their boots.

For a couple of years now, skeptical politicians across the western world have been wondering whether US tech giants are getting too big for their own good.

But ask one of Silicon Valley's most feared regulators, Margrethe Vestager of the European Competition Commission, and she'd say no.

Vestager has handed out multibillion dollar antitrust fines to pretty much every tech titan the US has produced in the last 20 years, but that doesn't mean she wants to see them torn apart.

The renewed interest and engagement with regulation from the US is "very welcome," said Vestager.

In the scandal's wake, Vestager is keen to see the company say less and do more.

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