This is
very
different from Apple or Microsoft (assuming they had iphones / windows laptops), they are B2C and are not managing individual customer relationships.
Salesforce is a B2B company and actively manages every relationship that they have with every individual customer, because lots of their customers are businesses that are willing to pay $10K/yr, $100k/yr or even $1M+/yr for their cloud products (why? the world may never know).
This means that "Customer Success Managers" are constantly reaching out to Salesforce's customers to up-sell them. Anyone who works with Salesforce knows that the salesforce folks are constantly schmoozing their customers for an up-sell.
This report shows that Backpage was no exception. So people at Salesforce were emailing, calling, customizing software for, taking out to lunch and making deals with a company selling child sex slaves online. They knew and took the money anyways.