“The bullies at Nikon? Imagine that Nikon wanting to make sure all F-mount lenses work as advertised on their bodies. “
Then they give the communication protocols to Sigma.
Your type of thinking is typical of the bureaucratic mind that seems to be prevailing in the West these days, even the UK and US.
I agree they aren’t really bullies, just fixated on their short-sighted we-want-it-all business plan. A bit like Fuji and their unwillingness to handover the x-trans processing source code.
Self-defeating.
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.