Mono has no reason to live anymore, hence the lack of commits and contributions
It is a dead project, I wonder what winehq has in mind here
edit: as pointed by the comments, mono supports .net runtime before the newer ".net core" (which is not compatible). Because wine wants to be able to run older windows code, they probably still use this.
Since then, microsoft supports https://github.com/dotnet/runtime, which is MIT licensed
Mono has no reason to live anymore, hence the lack of commits and contributions
It is a dead project, I wonder what winehq has in mind here
edit: as pointed by the comments, mono supports .net runtime before the newer ".net core" (which is not compatible). Because wine wants to be able to run older windows code, they probably still use this.