The tweet was when Eric Yuan knew something had to change.

Boris Johnson, the UK prime minister, shared a photo from his first ever virtual cabinet meeting. The cybersecurity red flags jumped out immediately.

Some cabinet secretaries' Zoom screen names were visible, you could see which platform the cabinet was running its computers on, and most glaringly, the meeting ID was visible for all to see.

The significance of the moment was not lost on the team at Zoom.

"That was the big aha moment," Zoom board member Santi Subotovsky told CNN Business.

Zoom founder Eric Yuan poses in front of the Nasdaq building after the company's IPO in April 2019. (Kena Betancur/Getty Images)

Zoom grew into a vastly profitable business selling software to businesses that could enable a venture capital firm to seamlessly take virtual pitch meetings from around the globe or an executive to deliver an all-hands to a remote workforce. Powering British Cabinet meetings was never on the radar.

"Our company that used to be a 100% enterprise-focused, is now powering the world. It's powering governments, education, social activities... And then when the other shoe dropped, it's like we need to get ready for that," Subotovsky said.

Zoom was already enmeshed in controversy. Less than two weeks earlier, The New York Times had raised the flag on "Zoombombing," opening the door to a flood of scrutiny, from its feeding data into Facebook to the New York State Attorney General scrutinizing its data practices

But for Eric Yuan, the 50-year-old founder and CEO of Zoom, it was the Johnson tweet that changed everything.

Boris Johnson tweeted: This morning I chaired the first ever digital Cabinet. Our message to the public is: stay at home, protect the NHS, save lives. #StayHomeSaveLives

"This was our wake-up call," Yuan told CNN Business over a Zoom interview from his San Jose home in April.

Yuan blames himself for not anticipating that users might want to share a screenshot of a meeting. For his business clients, sharing a screenshot of your board meeting would be unthinkable. But business clients weren't his only worry anymore. The world had become his customer.

Within a week, Zoom pushed out an update that would hide the meeting ID from view. But for Yuan and his team at Zoom, the damage had only just begun.

Yuan built Zoom to please his customers — to use Zoom-speak he wanted to "deliver happiness" — and for years that meant giving his business clients a high-quality video conferencing platform that was easy-to-use. "Frictionless," as the company likes to say.

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But during a global pandemic that has transformed Zoom into an essential tool for schools weddings, and the cabinet of a G7 economy, Yuan is trying to figure out how to make Zoom something it was never meant to be.

Now, "Zoom is not only a business communication company, suddenly it's becoming an infrastructure company," Yuan said.

Since the pandemic, Yuan has had little time to enjoy his family's multiplying fortune ($19 billion at last count, according to Forbes ). He refers to this time as the most stressful weeks of his life, which now consists of three things: Zooming, eating and sleeping, and he's barely been doing much of the last one.

"I've had several sleepless nights" Yuan said in front of a virtual background with the words "WE CARE" hovering over a heart-shaped earth.

What is the question keeping the CEO of the company — one that is now worth more than double General Motors —up at night?

Yuan takes a breath.

"How did we get here?"

Zoom is headquartered in San Jose, California. (Smith Collection/Gado/Getty Images)

Shandong to Silicon Valley

Yuan grew up in the Shandong Province in China in what he describes as a middle-class family. The child of geological engineers, Yuan was an average student who studied computer science, and after a stint working in Japan, decided he wanted to come to the center of technological innovation: Sil...