From a business point of view, it’s better to make a profit by selling on your name only, than not making a profit at all, which is currently the case for the other mentioned companies’ imaging divisions.
And to be fair, Canon does offer good, solid products at all levels from entry-level to professional, an extensive system of lenses and accessories, and good customer service.

Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.