True, some users might have some switching pain, but that's true for most things. Windows to Mac, Xbox to PS3, Kindle to Nook. Lock in is real, but rarely determinative.
Consumers vote with their wallets. The free market is a powerful thing.
It strikes me that this is a pretty unreasonable complaint. If it looks like a duck, walks like a duck and quacks like a duck, I don't think it's fair to moan when it turns out it's a duck.
I'm not knocking Apple, I like Apple but we as consumers need to be aware of what we're buying into and I don't think we can moan that it was in anyway unclear the way they behave, particularly to the sort of person who frequents Hacker News and really can't feign ignorance.
I'm saying that shutting out apps because they don't cough up Apple's ransom only hurts the customer and that customers won't necessarily vote with their wallet and move somewhere else because they have already invested in their current platform/device.
Still, in this case, I think Apple is engaging in a weird sort of brinkmanship with distributors, and I'm not sure they're in a position to dictate such terms.