Both 1 and 2 are "irrational" as seen from the company as a whole. Canon does not exist to boost their R&D people egos, or to make DPP at any cost. They (I would assume) exist for their owners to maximize profits.If this is true, I would expect them to continue.
The reality is it's both 1 & 2...Not Invented Here
is a really big motivation in Japan (not racist, just reality). As far as #2, they (Nikon and Canon both) "think" that having an undocumented, proprietary raw file format "might"
give them a leg up and it's that "might" that is the main motivation...
If the industry (meaning everybody else other than Nikon and Canon) were to come out really strongly AGAINST
undocumented, proprietary raw file formats, they would be far more likely to blink.
That's why it's sad that any photographers would ever consider supporting Nikon and Canon's current misbehavior...
Unfortunately, the more photographers that drink their Kool-Aid and give them any possible wiggle room (meaning reject the call for standards) the longer it will take to make them behave correctly...
I know there are a few people here on LuLa who equate DNG with Evil Adobe Greed
...but I can't express just how ignorant and wrong this is...DNG is a gift to the industry by Thomas Knoll. Adobe supported Thomas' desire to develop a raw file format standard...Adobe created DNG for free, revised the DNG SDK multiple times to address industry critiques, offered DNG to the ISO and has bent over backwards to try to help the industry. Sadly, some people still reject the value of DNG for a multitude of motivations (most of which are either ignorant or coming from petty agendas).
Adobe has done a lot for the industry that they don't get credit for...initiatives such as DNG, XMP and other technologies that Adobe has developed and given away for industry use.
The real problem is Nikon and Canon can get away with their misbehavior because way too many photographers are willing to accuse Adobe of being an evil monopoly while giving Nikon and Canon a pass on being petulant brats that refuse to play well with others.