I would hope the total required is from revenue generated by your Unity project, not total revenue of the company. If not, that's a huge mistake on their part as it would encourage companies with unrelated revenues to go elsewhere. Which was exactly your response.
From the license: "The free version of Unity may not be licensed by a commercial entity with annual gross revenues (based on fiscal year) in excess of US$100,000, or by an educational, non-profit or government entity with an annual budget of over US$100,000."
My reading of that is that it is the total revenue of the company, no matter how small the Unity project might be.
I agree, the wording is total revenue, gross at that, of the company even before you start on a Unity project. But hey, it's their engine so they can license it however they think works best for them.
But I wonder how it works if a company with that much gross revenue hires a third-party that does not make that much revenue to create the content for them. I guess the rule would apply to the third-party.
If it's just for the project inside the company, a big company could set up an internal "project" for just the Unity stuff, and not pay for the full version. So no one would pay for the full version.
The full version does come with a bunch of extra features not in the free version, so there are reasons to buy it even if you aren't forced to by the licensing requirements.
