>It's unlikely that "regulators" had anything to do with it, given the quick resolution.

Disagree. EU regulators act quickly. Here's the commissioner for Internal Market of the Eu: "I take note with satisfaction that following our contacts Apple decided to backtrack its decision on Epic exclusion. From Day 2, #DMA is already showing very concrete results!" https://twitter.com/ThierryBreton/status/1766167580497117464