It would be difficult to criticize The Trade Desk's (TTD -1.42%) recent business performance. Everything seems to be going right for the company. Revenue is growing at robust double-digit rates, customer retention remains extremely high, and the company has a debt-free balance sheet and plenty of excess cash flow. This financial success, of course, isn't too surprising for those following the company closely. The programmatic advertising specialist's product execution has been astounding in recent years. Th ...