Oh this should be a nice opportunity for hackers. They don’t usually know much about those mainframes, AS/400’s, VMS boxes, etc. The apps are usually so old you gotta debug the code and the user interface. They might not even be able to afford money to buy them for digging out 0-days. Golang on a NIX or Windows server is something they can understand [to break].
Also, a neat article on the application of Go to backends that might help readers doing something similar in the future. Should be cheaper & more flexible than the other stuff I mentioned, too. :)