yeah, those are just modules that anybody can just buy. NVIDIA already makes jetsons which are basically SBCs with decent GPU. so again, what does Mediatek provide?
What do you mean by modules, exactly? In a smartphone, which is the largest market, and where Mediatek is pretty strong, many of those functions are integrated as part of a system on chip. Power consumption also required good interplay between the various subsystems. So it's relatively tightly integrated. You also must have good Android drivers/BSP. And phone vendors are not that interested in changing vendors alle the time. There are also a bunch of patents that one must license, which Mediatek likely already does. Often cross licensing with what is typically competitors (like Qualcomm, maybe even Apple), which takes a bunch of time to set up.
looking back at the news releases: Mediatek seems to bring CPU design expertise on the table, which makes sense, they have much more experience and know-how in this than Nvidia. Mediatek is a top tier company with excellent engineering talent. Ideally Nvidia would acquire such a company so that they can challenge AMD and Qualcomm better but this doesn't seem to fit for their strategy to keep it small and focused. Hemce such a partnership works better for them.