I presume you mean no clone Amigas?
1. Commodore didn't licence the chipset.
2. Reverse engineering Agnus/Denise/Paula was not cost effective.
Only simple machines have pirated clones usually, like the Hong Kong Apple II machines costing 2/3 to 1/2 the price of the real thing.
PC being cloned never helped IBM's fortunes, Microsoft were the only winners in that situation with DOS/Windows.
Draco System made a clone. They didn't have the AGA/ECS-chipset, but atleast the Kickstart iirc. And then we have the Access amiga clone (an Amiga 1200 in a 5 1/4 form factor). Perhaps a Escom license though. Perhaps not true clones... but still.
edit: Macrosystem didn't have a license I see now. It's an interesting clone computer still.
