You want to build a trillion dollar company? Fine. Corporate tax rate of 50%. You're a small business with less than $1M in revenue. Cool. Corporate tax rate of 0%.
Big companies will break up to take advantage of the tax code. Problem solved.
Instead, the bigger you are, the harder you can lobby for tax breaks. Currently, if you're a $1M company, that sucks. You pay 20%+. If you're Amazon, you pay $0.