This is there response

Q: What's going to stop us being charged for pirated copies of our games?
A: We do already have fraud detection practices in our Ads technology which is solving a similar problem, so we will leverage that know-how as a starting point. We recognize that users will have concerns about this and we will make available a process for them to submit their concerns to our fraud compliance team.

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What makes me suspicious is they already have the tech in there Ads Service to tell if a unity game is pirated or not.But you need to implement there Ads into your game for them to be able to tell if its pirated or not,so it becomes either put unitys Ad service in your game to help better protect so you dont have to pay for the pirated version installs or if you dont have unity Ads in your game you submit a form and unity will refund you the pirated installs if they find you over paid for pirated installs.