Topic interest is not question demand
A broad topic can attract attention without proving that buyers ask the particular question a firm is equipped to answer. Keyword volume is therefore a poor substitute for demand at the level where the firm would invest.
Delphic estimates demand for that buyer question and its common phrasings. The result helps the firm decide whether closer investigation is worthwhile before it commits research, authority or public evidence.
How the estimate and its confidence are produced remains protected.