A grand tax loophole for the ultrawealthy is very easily multiplied

Once aimed at small businesses, it's a popular way for Silicon Valley founders and investors to avoid taxes on investment profits

This is the story of the incredible cloning tax break. In 2004, David Baszucki, fresh off a stint as a radio host in Santa Cruz, California, started a tiny video-game company. It was eligible for a tax break that lets investors in small businesses avoid millions of dollars in capital gains taxes if the start-ups hit it big.
 
Today Baszucki’s company, Roblox, the maker of one of the world’s most popular video-gaming platforms, is valued at about $60 billion. Baszucki is worth an estimated $7 billion.
 
Yet he and his extended family are reaping big benefits from a