Your redefinition of 'core business' is confusing.
IBM's core business is monetization, by definition. Making services that enterprises like to use is what they do to feed that core business, not vice versa.
Walmart's core business is monetization, by definition. Selling goods that people like or need is what they do to feed that core business, not vice versa.
Toyota's core business is monetization, by definition. Selling cars that people like or need is what they do to feed that core business, not vice versa.
The local florist's core business is monetization, by definition. Selling flowers that people like is what they do to feed that core business, not vice versa.
Every for-profit's core business is monetization, by definition. Performing a large variety of things that make money is what they do to feed that core business, not vice versa.