yes, it should even be said that there are almost only deputy factories, but there is no original factory.

You may not know Hasselblad very well. Hasselblad is a workshop that makes fuselages, and doesn't design and manufacture lenses. Of course, Hasselblad almost doesn't even make fuselages now. Therefore, Hasselblad cameras have been using lenses designed and produced by other manufacturers, such as Kodak, Schneider, Zeiss and now Fuji. Only in the era of Fuji, the cooperation with Hasselblad was closer (Fuji also produced the fuselage for Hasselblad), so the design of the lens and the fuselage was unified, which made people feel that the xcd series lens was like the original lens. In fact, some models and batches of xcd series lenses even used the trademark of Fuji Long.

as for why other manufacturers don't participate in Hasselblad lens, on the one hand, Hasselblad is a medium format camera, and the market share of medium format itself is very low. If you don't design and produce lenses of this specification yourself, you have to do it alone, which is costly and difficult to guarantee. On the other hand, Hasselblad's machines are now shuttered between mirrors, so even if it produces medium-format lenses suitable for other brands, it can't be used as a lens for Hasselblad cameras simply by changing its mouth, so it needs to increase the shutter device, which has a certain technical threshold.