While it's true that concept originated with Campy (which is why we're still calling it a "gruppo" after 40+ years), but Shimano owns an enormous chunk of the b

While it's true that concept originated with Campy (which is why we're still calling it a "gruppo" after 40+ years), but Shimano owns an enormous chunk of the bike component market, more than 80%, so they have really made incompatible product lines into a way of life for the industry (with some sniping from SRAM, who make Shimano-compatible parts that often work better than the originals; I have a SRAM chain on my other wise Shimano drivetrain, for example).