You install AutoCAD on a cloud VM. You then remote desktop into that VM from any device—even an iPad. All processing happens in the cloud; your local device just streams the screen.
AutoCAD is a power hog. Even a modern laptop may only last 3-4 hours running complex drawings. house of portable autocad
For those needing mobile or cloud-based access, Autodesk offers legitimate solutions: AutoCAD Portable for PC [Final] x86x64 Full Instant You install AutoCAD on a cloud VM