After initially telling Axios earlier Tuesday that a player installing a game, deleting it and installing it again would result in multiple fees, Unity’sWhitten told Axios that the company would actually only charge for an initial installation. (A spokesperson told Axios that Unity had “regrouped” to discuss the issue.)
So they’re trying to track it per device, which can also be exploited fairly easily.
Unity seems to imply that it only counts 1 install per user, but depending on how the phone-home works I’m sure this can be tricked somehow to get a similar result.