An ad of a vendor makes a claim that is hard to credit

In the July issue of Claims Mgt, at 30, there is an advertisement by Bottomline Technologies. In bold print at the top the ad proclaims “Bottomline is chosen three times more than any other legal spend management vendor.” I know executives at the company and to the extent of my knowledge of them and their products I respect them. That said, however, this claim strikes me as curious, impossible to back up, or cleverly ambiguous.  Surely they don’t claim to have triple the number of users as any other vendor in that crowded space!  Perhaps they define “legal spend management” in a narrow way that favors their claim?