A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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I question your lifecycle estimate but even if that is the case you could expect HUGE new revenue streams as there is an army of FREE users right...
I like the free version it is great but the courses I am taking at 3D Buzz quickly got out of the basics and went into features that are not...
He was right. 3DBuzz is where you want to go.