Yep but that should be made clear and not just implied, because at the end of the day, their users who signup with Apple will be unable to use their web app because of the developer choice not to implement it (which is definitely their right not to do so, they can handle the support), and not Apple not giving them the APIs.
Yeah, this is the part that makes the developer not just petty, but actually quite disingenuous and actively hostile to their own users.
It's one thing to argue against the policy and there's nothing wrong with that. But it's unacceptable and close to outright lying to imply that the policy decision makes the user's account only usable with Apple devices.
The really puzzling thing about all of this is that the developer's primary issue - he believes Apple is being hostile to developers - is exactly what he's doing to his end users.
Apple took away his choice, so he's taking away his users' choice to use the feature as they desire.
