As others have noted, this creeping phenomenon affects mainly US customers - in this latest instance anyway.
However, it has other consequences to competition in the world market, without the "price setting" of the dominant market.
There is also likely to be considerable collateral damage in the US market; not from what people are discussing now, but a result of the "banning" of easily-accessible price-comparison information.
That effect is this: a customer can no longer hit a few web pages and glean the best deal on the day. They must now jump through multiple hoops and consume not only their own time and resources, but those of however many retailers they choose to canvas, looking for the best price.
Instead of 'doing the rounds' in a few minutes with a web browser (or a visit to a price-watch site), they will find themselves calling toll-free numbers, waiting on hold, waiting for call-backs, adding items to yet more "abandoned" shopping carts and other hugely time-wasting activities. Instead of the retailers' websites doing all the work, they will be answering telephones and writing out quotes. Which is clearly much less efficient. I suppose it will create jobs though! Expect prices to rise as a result.
The 'first resort' of some of these retaillers seems to be bundling excess stock into questionable 'deals' as 'free bonus items' at the MAP. Deals which are very hard to compare.
Noone is stopping the retailers from selling at lower prices - only from advertising those prices.
Which brings up an interesting conundrum. If a certain price-watching site (or any new one) decides to collect and publish the "best price of the week" off their own bat, is there anything Canon can do about it? If that website is independent and not owned or controlled by any Canon Authorized Dealer, can it be considered "Advertising" at all? All it takes is a link with a 'coupon code'...
There is a business opportunity right there...