The idea that a company is "siphoning out" value is fundamentally flawed. The company is creating value, and society enables it. This enablement is ongoing, and should be paid for with ongoing tax. If the actual value creator decides that they can get a better deal somewhere else, then barriers to exit come in because the government is trying to get more out of a company than it provided. (Since if there are superior places to operate, the worth of what the state you are leaving provides must be overvalued, otherwise you wouldn't leave).