DOS and Windows weren't the most glorious software to ever stalk the Earth, they were the operating systems that happened to get popular on cheap hardware. Arguing that Bill Gates created all that wealth that comes with the network effect inherent in software and a homeowner is unduly appropriating community value is really something or other.
So, sure, he was lucky in a way, to be around and read it, but it seems unfair to say he merely appropriated value that belonged to everyone. The advice was worthless to the person giving it away, and everyone else.
I mean, there is actual historical evidence of other cheap operating systems for cheap computers and so on.
Likewise, the results of hoarding the vast wealth in the forms of property, land, legal entities that operate and depend on these same communities which generated them is damagingly extractive.
We should, too, somewhat reverse the hoarding of vast wealth and let our communities reap some benefit from the treasures they are capable of producing.
This doesn't really follow at all, and is directly in contradiction with your desire to get rid of Prop 13. Property taxes are the most common wealth tax!