Campy sells all the product they can make. They've beaten the competition to 10, 11 and 12 speed and never made their hubs obsolete, like the competition. With 10 speed, it took 4 years for shimano to catch up. Now shimano will lag at least 2 years before they catch up with 12 speed.
There's info out already about the compatibility of campy and sram 12. The sram axs chain isn't supposed to work with campy 12, but it does. I've used the axs chain on both of my chorus 12 equipped bikes. Others have mixed campy and sram 12 cassettes with no problem. Campy hubs can even be converted to a sram XDR driver, to use with sram 12 cassettes.
Just because you don't see campy parts on prebuilt bikes at your LBS doesn't mean a thing. It's been that way for over 20 years.