Steve Jobs apparently spent several years after his daughter was born denying she was his, alleging his girlfriend must have cheated on him, etc. Incredibly self-centered and childish reaction, but typical of a certain mindset… that maybe if he repeated loudly and often it would become true. Obviously along with this he paid nothing if he could get away with it.
Does he owe the mother anything? Technically, no. A person is entitled to act like a dick. Technically, he was obligated to pay child support if/when ordered by the court.
Morally - well, the way I understand child support works nowadays for Ontario and most of Canada is this (simplified): take the sum of the two parents’ income. Calculate the proportion that would be used to support a typical child with that level of income. Each parent pays the proportion of that amount from their income - so the non-custodial parent deducts the custodial parent’s share from the total and pays the difference. There’s a table for normal incomes, but when you get into the millionaire stratosphere, there’s a formula.
The theory is that the child then gets to enjoy something close to the lifestyle they’d enjoy if the parents were together and living the appropriate lifestyle, even if (mama) is nowhere near that rich. It pays for the size of house, the car, private school tuition, vacations, etc. If the poor mother also gets that benefit, well then sucks to be a millionaire daddy with plenty of cash still left over. So had that system been applicable in 1970’s and 1980’s in California. Jobs would be paying a shitload more than $385 a month.