Games made in Unity or Unreal Engine literally do not require any additional effort from the developer aside from choosing Linux as the build target from a drop-down menu. So native Linux ports of UE and Unity games cost virtually nothing.
You still need to keep supporting it for future releases, make sure it actually works and not just builds, test, update QA pipeline, tell support, etc etc
Games made in Unity or Unreal Engine literally do not require any additional effort from the developer aside from choosing Linux as the build target from a drop-down menu. So native Linux ports of UE and Unity games cost virtually nothing.
You still need to keep supporting it for future releases, make sure it actually works and not just builds, test, update QA pipeline, tell support, etc etc