Earlier this week the company said it wanted to charge its customers a fee every time someone installed a game based on the engine. It said the charge would only kick in once a game hit a certain number of downloads, but could be as much as $0.20 (£0.16 GBP) at the top level. This generated a quick, angry response across the games industry.
https://www.bbc.com/news/newsbeat-66810296