The word "extracted" does not betray a belief that value cannot be created. You can "extract" value that is created just as you can extract value that was there already. The question is not whether or not value was created, the question is who deserves to control the value that was created.

The fact is the billionaire managed to extract value from the market. The ethical question is: who deserves to get the value that was created by the market? The answer could be "the founder" but it could also be the funder, the worker, the customer, the political structure that enables the market economy, the mother of the funder who raised them to be hard working, the nurse that treated the founders minor illness in an early stage and prevented it from causing a physical disability, etc.