On the high end, the main competitor of Shimano is Campagnolo

Campagnolo is pretty much niche nowadays with a less dense dealer network and few OEM contracts.

Look at Campagnolo like Ferrari, only offering select high end items for the road while Shimano is more like Honda offering anything from the little Aygo to the Acura NSX and also offering SUV/trucks. Sram would be more like Mercedes, tackling the mid range to upper end but skipping on the really lowest end.

Not anymore they aren't. SRAM sell far more high end groupsets than Campy these days.

Yes - and they are not in the Mountainbike market which is dominated by sram and shimano.