[adobrawy]

This is an edge case, but free (or almost free) games are given away on Humble Bundle. Some people may also believe that the game has earned its money, so they do not want to charge for it. A fee will be charged in such a case because the game once brought a profit. Some classics today are even open-source.

[safety1st]

So this raises a good question, does this essentially end the inclusion of all Unity games in Humble Bundle and Choice? These programs result in a ton of installs for very little revenue per install going back to the dev.

A real common thing is for a game studio to release a new installment in a popular franchise, and then make the previous installment(s) available through a Humble promotion to advertise it. This is a great model, gamers get cheap and good games, the studio gets more exposure for its franchise that leads to full price purchases in the future. (Worked on me with Divinity Original Sin and some others)

It feels like Unity has just killed off this model. Screw them, I now hope Unity goes out of business ASAP.