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.

Essentially, these companies, which represent thousands of games with billions of downloads, have blocked Unity from making any more money in their games. Some of the companies represented in the letter include Voodoo.io, Azur Games, and SayGames, with each claiming over 100 games.

There have been numerous messages from developers urging the company to reverse course. Others have threatened to never use Unity again or port their existing projects to other game engines. This collective action from developers represents the next escalation in the fight between Unity and its users.

At the heart of the matter is the news that Unity will update its pricing structure to charge developers for each installation of a Unity game after specific download and revenue thresholds are met. Though Unity asserts that only 10 percent of its users will be affected, it is still unclear how Unity intends to track installs and how it intends to differentiate a “valid” install from an “invalid” one.

Beyond monetary concerns, developers are also angry because the new pricing represents a breach of transparency Unity established with regards to its terms of service.

It is common for companies to often change their terms of service and terminate agreements based on TOS violations. In 2019, Unity did just that, terminating the license for software company Improbable citing TOS violations. The action caused outcry in the community, and in response, Unity reinstated Improbable’s license and committed to keeping users informed for future terms of service changes.

In a blog post in 2019, Unity wrote, “When you obtain a version of Unity, and don’t upgrade your project, we think you should be able to stick to that version of the TOS.”

That statement is reflected in a version of Unity’s TOS from March 2022. “Unity may update these Unity Software Additional Terms at any time for any reason and without notice (the “Updated Terms”) […] if the Updated Terms adversely impact your rights, you may elect to continue to use any current-year versions of the Unity Software […] according to the terms that applied just prior to the Updated Terms.”

Moreover, in that 2019 blog, Unity stated that it would track changes to the terms of service on GitHub “to give developers full transparency about what changes are happening, and when.”

However, Unity has since deleted that GitHub repository. And, back in April 2023, introduced a new terms of service agreement that removed the clause that allowed for developers to use older TOS while introducing a new clause that seemed to suggest the now controversial runtime fees were on the way.

2.2 Unity Runtime
Subject to payment of applicable fees, (emphasis The Verge) if any, you may distribute the Unity Runtime as an integrated part of your Projects, solely as embedded or incorporated into your Projects, and solely to third parties to whom you license or sell your Projects or who provide you with services, in each case pursuant to an agreement that is no less protective of Unity and its licensors and its service providers than this Agreement.
In video game development, it is common to “lock in” specific versions of a game engine. Theoretically, developers unhappy with the new fees could have simply “locked in” a previous version of the Unity engine to avoid them and Unity’s own terms of service would have supported that. But with this change, seemingly made in contravention of Unity’s own stated goals of transparency, anyone using a current version of Unity has seemingly agreed to these Runtime fees before they were even announced.

The Verge has asked Unity for comment regarding the deletion of its terms of service GitHub and on this recent action by mobile developers. Though Unity has yet to respond, it has responded to the boycotting developers.

According to an email reviewed by The Verge, a Unity representative acknowledged that the company’s ad monetization programs had been paused for an app and remarked that it was likely because of the new fees. The rep went on to say that, in response, Unity would suspend its user acquisition programs for that app — essentially limiting the app’s ability to attract new users.

Though this action will hurt these companies financially, to them, it’s not just about money.

“The new regulations from Unity will affect every project that doesn’t generate sufficient income per user,” said Nikita Guk, CEO of PR firm GIMZ, who organized the letter. “Pushing developers to either migrate to alternative game engines or place even greater emphasis on monetization, at the expense of creating immersive gameplay experience.”

So far, 19 companies have signed the letter, and more are urged to follow suit.

“If you share our sentiment, we call on you to join us. Turn off Unity monetization until a fair and equitable resolution is found.”