If SF were a low-tax place that noticed a bunch of businesses coming in and decided to harvest cash from them, this line of reasoning would make sense. Instead,

If SF were a low-tax place that noticed a bunch of businesses coming in and decided to harvest cash from them, this line of reasoning would make sense. Instead, SF is a high-cost, high-tax place where businesses are founded in droves. Twitter is trying to skim the value of massive social investment in SF by moving just outside the city borders. It is not trying to move to Lawrence KS, San Luis Obispo CA, Rochester NY, or any other low-cost city with a well-educated workforce, behavior which would support your thesis. Nor are many tech startups being founded in those places. Large investments in social and physical capital have consequences: fantastic, $100K+ engineering jobs and $1.5K taxes to pay for the schools, police, and roads that support them.