I agree with Apple's stance. The landscape has changed. To be a tech superpower is to have your own pull, and to be able to make unilateral decisions on behalf of your business and your customers/users. That is what Apple has done here. I happen to agree because I already like Apple's implementation of Sign in with Apple specifically, even though I have never used it. I also agree with Apple's stance on privacy generally.

I don't like that Apple forced this decision in this way, but I am fine with the outcome in general, but am saddened to see that it negatively affected a developer whose product I use. However, I question the Pushbullet dev's dedication to the iOS platform. Mobile development is a moving target. To single out Apple for blame for changing the App Store conditions for apps is silly. You could just as well blame the dev for not keeping up with the times.

BTW, between them and facebook (React, GraphQL) that pretty much sums up my stack/tools of choice