Last click is a billing rule, not an attribution model
Almost every affiliate contract in the market settles on last non-direct click, and almost every marketing team then reads that ledger as if it described causation. It does not. This is the long version of the argument we have with advertisers in week three of every program — with the four models we actually run side by side, what each one does to publisher payouts, and the point at which switching model costs you more in publisher churn than it gains you in accuracy.