I see this as a serious question for Apple because it is entirely their fault that they may have harmed this company from a lot of revenue if they were allowed to use USB like Duet can. I'd suspect Duet wouldn't come out if this company or others can use USB in the first place.
Seriously, while I love Apple, I actually want this company to file a lawsuit against Apple for anti-competition violations. Apple is intentionally allowing one company to succeed based on this sole feature while preventing others from using the same feature.
And no, a legal wall garden or monopoly should not be allowed to favor one company over the rest. It must be equal to everybody or they should be fined severely and/or prevented from doing this again.
We are somewhat concerned about getting sherlocked, but I have no idea what to do about that other than push on!
Now you have to be a part of some good ol boy club with access to the right backchannels to develop software these days?