If we look at Gartner's Analytics & BI magic quadrant from Feb 2019 (https://www.qlik.com/us/-/media/B0DCF50C816448EEAC8981B02387...) it becomes clear that Tableau(Salesforce) & PowerBI(Microsoft) are the driving force in the area.

The move to buy Tableau likely comes from an interest in enhancing cross-compatibility between Salesforce+Tableau, the ability to provide a more robust service offering that can compete with Microsoft (e.g. If you buy our CRM solution, we will give you Tableau for a 25% discount) and a concern that another big player would have come in and taken Tableau.