UPDATE 19/07/22: Mini Metro developer Dinosaur Polo Club has responded to the release of copycat game Mini Subway.
"As a small indie studio, we recognize that our own successes are, in part, due to standing on the shoulders of giants, and that part of the creative process involves taking inspiration from others and making it your own. Seeing people take inspiration from our games has been an amazing experience, but of course, there's a difference between inspiration and plagiarism," a spokesperson told Eurogamer.
"We owe it to our team to defend the work we've invested so much into, so we evaluate every report of copycat or clone versions of our games to assess whether they breach our trademark. While we always try to reach out to the developers first, if required, we will take legal action.