[sdsd]

>How come the US government allows this?

Allows? The government works for the wealthy and powerful. That includes the masses, who (if they organize) have their own power, but it also includes every other powerful group or individual.

Why would the government want to stop this? It's the average person who would want to disallow this, and they'd have to pressure the government enough that the pain of popular opposition outweighs the brazillions of dollars they're making.