validation and coverage. focus on our customers. i think that set us free. >> the company's growth started relatively slow, until the decision they made to offer a free version of the product, one of the first companies to capitalize on the premium model. >> we were at 100,000 customers at the time, then a million and three million. >> today, they have 18 million customers, and, no surprise, the founders have gotten tantalizing offers, including one to buy the company for $1 billion, cash. and you said -- >> i said no thank you. >> they met to discuss the pr proposition. >> that lasted 15 minutes. i have enough money, how about you? >> yeah, i have enough. but, this would be more. but i don't need more, do you need more? no. something happens when employees