So that's it for id Tech? If so what a sad ending to a legacy going back to the early 90s. I don't understand why they stopped licensing their technology to ot

So that's it for id Tech? If so what a sad ending to a legacy going back to the early 90s. I don't understand why they stopped licensing their technology to other companies? Seems it was a big part of id's business back in the 90s and 2000s.