Can Unity just unilaterally alter the fee structure its developers were relying on, even for development projects that were started (or even completed) under completely different legal terms?

For years, the Unity Engine has earned goodwill from developers large and small for its royalty-free licensing structure, which meant developers incurred no extra costs based on how well a game sold.

However, immediately after the announcement of the revised price structure, many negative comments were received from game developers, and Unity announced that it would review the new price structure.

Unity Software posts disappointing Q3 revenue, partly due to runtime fee introduction headwinds continuing in October, one analyst says. There was limited visibility into “the nature and extent ...