This particular field is difficult. Other than Google (through Search and also its acquisition of Metaweb), no other company has managed to achieve tremendous revenue with a knowledge base product alone. Cyc, Wolfram Alpha, the original IBM Watson (the expert system, not the ML APIs borrowing the brand) are all surviving but not thriving.
Don't forget the original knowledge base product - Bloomberg. They still bring in a lot of cash each year, but as a private company we can't get exact amounts.
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This particular field is difficult. Other than Google (through Search and also its acquisition of Metaweb), no other company has managed to achieve tremendous revenue with a knowledge base product alone. Cyc, Wolfram Alpha, the original IBM Watson (the expert system, not the ML APIs borrowing the brand) are all surviving but not thriving.
Don't forget the original knowledge base product - Bloomberg. They still bring in a lot of cash each year, but as a private company we can't get exact amounts.