If you taxed him half of that wealth he'd still have single digit percentage of the company.

The broken tax system is that I get taxed about 50% on my marginal income dollar --- the system doesn't wait for me to spend it first --- but when his stock portfolio appreciates by a dollar, he's not taxed! Not until he sells in order to spend. Why are we taxing labor so much more than capital?

And no, I don't think that inventing pagerank really entitles two people to $200B. Although in their case I don't think they've done as much harm with it as some other billionaires.