Corporations exist to generate profit, they have no other reason for being, and they will do anything to protect those profits - including using any loophole, accounting process, business model, or pricing strategy to protect said profits.

A simple/common form of this subversion is giving the c-suite ungodly salaries such that there are no profits, on the books at least, to be taxed. In that case, and basically all others, the customer is paying the corporate tax because the corporation has shifted all burdens (including tax) away from the protected profit.