[arp242]

The dmd compiler not being open source until 2017[1] made it more or less a non-starter for a great many use cases. That would have been okay in the 80s, but with tons of languages to choose from since the 90s/00s, your language needs something very special to sell licenses.

[1]: Specifically: "The Software is copyrighted and comes with a single user license, and may not be redistributed. If you wish to obtain a redistribution license, please contact Digital Mars."