Sadly, season 2's top spot on one of my DCs went to an obvious wintrader, and a peek into pvp community discords shows this is anything but uncommon. Match fixing is incredibly trivial to accomplish and it seems every dc has known trolls, throwers, and win traders.

Seeing it for myself, it's honestly kind of a farce. Just like how the status of ultimate weapons is degraded by paid carries, the same is true for top 100 rewards when you cannot be certain the person you're looking at didn't cheat. As long as this is the case, being conservative with exclusive rewards is the most equitable state of affairs.