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So are developers actually angry because apple has done something bad or are they angry that they’re not harvesting the personal data of all of their users?
Pretty much. And, there are folks here that don’t want to see SIWA anywhere. Is it because they like providing their personal data to advertisers? Is it because they don’t want anyone to be able to AVOID Facebook and Google? It’s possible, there’s all kinds of folks in the world. :)
 
It's anti-competative because it forces developers to use a service they may otherwise not have wanted to use, and also encourages vendor lock-in - users are less likely to switch to a different platform if all of their crap is "signed in with Apple", making it much harder to migrate to android, for example.

Forcing devs to include it, then advertising it as the "better option", will naturally encourage uptake. Yes, it has its benefits on privacy, but it's more about locking people to the ecosystem in reality.
Developers also enjoy the benefit of Apple's platform. If you want to be a part of a platform, you have to play by the rules. You don't get the benefit of someone else's innovation without paying to play. This is the same discussion I have with people who buy Jeeps. It's a platform vehicle. If you want to build stuff after market, when Jeep changes designs, you're forced to adapt. That's the price to leverage the work FCA has already done.

Show me the data on a different platform is signed in with Apple? I can use sign in with Google on my iPhone. Alternatively, I can use my sign in with Apple on my Windows device.

You're absolutely right it is the better option due to anonymity. Apple has stood by privacy as a key selling point. So yes, getting people to buy into privacy is a really smart move. And as someone who lives in a country that values freedom and privacy, I'll continue to buy into a platform that focuses on privacy even if it locks me in. I don't see any other major tech companies helping out in this space.
 
Sign In with Apple is the best thing since the iPhone. Now I don’t get so much spam mail. Stop being sore anti trust. So dumb.
 
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