There is no such thing as "making an assumption" on what a process "should be". I am asserting what it should be. A multi-trillion dollar company should absolutely have a robust review process in place. If one single person can submit plagiarised and defective material onto an official platform that implicates the company as a whole in copyright infringement, management has failed, ergo multiple people have failed, ergo the failure is systemic.

It is extremely well-known that individual humans make mistakes. Therefore, any well-functioning system has guards in place to catch mistakes, such that it takes multiple people making mistakes for an individual mistake to cascade to system failure. A system that does not have these guards in place at all, and allows one individual's failure to immediately become a system failure, is a bad system, and management staff who implement bad systems are as responsible for their failure as the individual who made the mistake. Let us be grateful that you do not work in an engineering or aviation capacity, given the great lengths you are going to defend the "correctness" of a bad system.