Of course this is a silly statement. If 100% of Apple developers decided to join a union in an attempt to collectively bargain, of course Apple would negotiate.

Of course this is a silly statement. If 100% of Apple developers decided to join a union in an attempt to collectively bargain, of course Apple would negotiate. If 1% join, of course they won't. Where the tipping point lies is an open question. It's fairly unlikely that enough people would ever get on board to find out, though, given the way things have played out thus far and the existing community.