Mashable looks at how some of the biggest names in tech make money, including Philadelphia search challenger DuckDuckGo (which still isn't profitable).
As one might expect, advertising and paid subscriptions are two major sources of revenue for these companies. The Internet has also given rise to a phenomenon known as “freemium,” when a company provides a base service for free but charges fees for certain premium features. For instance, Dropbox offers 2GB of free cloud data storage. If a user wants more space, however, he or she will have to pay up.
Original source: Mashable
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