This whole thing is absurd and overcomplicated - they could have just copied Unreal and slightly undercut them.

It isn't too complicated, but for example, a game which made $2 million in gross revenue would owe Epic Games $50,000, because it would pay 5 percent of $1 million, keeping the first million entirely—minus whatever other fees are owed, such as Steam's cut.

There should also absolutely have been a grandfather clause for games already released.

I get Unity needs to make money. They've never been profitable. But they've seriously overcomplicated the whole thing and gotten people angry at them.