The game developers affected by Unity’s new pricing model are striking back. A collective of developers across 19 companies, mostly based in Europe and mostly developing mobile games, has put out an open letter urging Unity to reverse course on its recently announced pricing model changes. The letter contains some of the same sentiments expressed by other developers this week but with one big twist.

“As a course of immediate action, our collective of game development companies is forced to turn off all IronSource and Unity Ads monetization across our projects until these changes are reconsidered,” the letter read.