The company will warn the person first. If more denounced happen then the company can turn off that person's account. The person will not be allowed. Not all companies are good. If it is a bad company who do not care.
Most companies are good and care.
Bad companies sometimes do not last long. Spamcop is only to help you report spam. Spamcop does not do anything to the spammer or his company. The company can not see who denounced them. Your name is removed.