There are few trading firms in california because of the non-compete situation. There are costs to everything even feel-good populism that seems like a no-brainer.
If a trading firm is going to use human traders they would not do it in Cali, because they will have to force their traders to work at uncomfortable hours. If a trading firm is going to use solely computers, they would not do it in California because the time a network signal takes to reach California from New York actually matters in computer based trading.
Nah dude, grandparent is talking about smart Robinhood traders
That doesn't make sense. If that were true, there would be one trading firm in California that only existed to hire traders from other firms and copy results.
There are also very few plantations, victorian workhouses and open pit coal mines. Some kind of businesses aren't worth having.
On a more positive note: I wish wealthy countries would pass laws to ban ship breaking in countries with weaker environmental laws. It seems like a terrible loop hole today that would not be very expensive to patch. When you look at how chemical plants operate in wealthy (mostly environmentally clean) places, pollution controls are front and center for the whole staff. They well know the fines easily exceed profits, and they don't want to wreck their own communities with pollution.
The real issue is when firms won't pay workers for this privilege. This should be outlawed. It is harmful to workers and competition ("free movement of labour").
This applies to pretty much any valuable information that fits in one person's head.