I believe Curry's woes all began when Cleveland resorted to attacking him again and again on offense. He was never the same after Game 2. For Game 1 he wasn't even a factor. They wore him down literally by way of running tons of PNR plays to force a switch so that Curry ends up guarding either Kyrie or much worse James. From then on James just orchestrated almost every offensive possession that the Cavs ran. Very smart basketball tactics by the coaching staff of the Cavs. They just forced and capitalized on the mismatches. Curry was outplayed all the way in this series by Kyrie. LeBron was in total beast mode from Game 3 all the way to Game 7.
A great year for the NBA. Let's see next year if they will have a tie breaker for the championship.