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Because Facebook has a budget for R&D, which works out to several salaries, and React is one of the biggest technical assets they have, so it's someone full time job to develop features and new versions of React to increase the moat and stock value of Meta.

It works out because it keeps a workforce of React Developers on their feet, learning about the new features, rather than doing other stuff. It's like SaSS for developers, only instead of paying a monthly subscription in cash, you have to pay a monthly subscription in man-hours.