AutoCAD 2019 was the last version to offer a perpetual license. If you find a sealed box or a reseller selling an old license key, you own the software forever. No monthly fee. This is highly desirable for freelancers.
In 2019, the workflow moved to the cloud. AutoCAD 2019 for Mac came integrated with Autodesk Drive and AutoCAD Web. This allowed designers to start a drawing on their Mac at the office, save it to the cloud, and review or edit it on an iPad or iPhone while at a construction site or client meeting. This flexibility was a game-changer for the Apple ecosystem, known for its Autocad 2019 For Mac