It's good that you guys have discovered that colour film can be developed in the same way as monochrome. However, this is nothing new at all. Way back in the 'seventies, there were several articles in the UK magazines about this very trick.
I think it was set off by the availability of cheap, outdated negative film. At the time, colour film was sold with quite short expiry dates and once those were past, the film was massively discounted. When Tri-X was ten shillings and sixpence, you could pick up a roll of out-dated Kodacolor for two and sixpence - less than a quarter of the price.
I bought a few cheap rolls and tried it myself but I found the negatives difficult to print, so I went back to using bulk film, which was only slightly more expensive than the discounted colour.