Hall made a post on reddit's r/gamedev yesterday giving an outline of how he believes they came down to the amount they wanted to charge him, which includes:

Then there are five listed items they supplies as evidence:

An @ rocketwerkz email, for a team member who has Unity Personal and does not work on a Unity project at the studio

The personal email address of a Rocketwerkz employee, whom we pay for a Unity Pro License for

An @ rocketwerkz email, for an external contractor who was provided one of our Unity Pro Licenses for a period in 2024 to do some work at the time

An obscured email domain, but the name of which is an employee at a company in Dunedin (New Zealand, where we are based) who has never worked for us

An obscured email domain, another employee at the same company above, but who never worked for us.