If it has FB screaming this loudly, I'm guessing it is having much more impact at FB than you are giving it credit. If it meant nothing to FB, then they'd just look at the changes from Apple, and shrug it off. No public outcry necessary. This is not what FB is doing.
The US gov puts massive pressure on Apple and Google to insert backdoors into their phones even though third parties have forever been able to crack them. It's all about cost.
The first party tracking enablement was given to Facebook for free since the beginning. Now it's being taken back. Now they need to pay ISPs and invest more strongly in fingerprinting efforts.
I'm all for the move - it is a step in the right direction. But in isolation, it doesn't change much for end users - they are still being tracked at a similar level. Facebook is trying to spin it as an end to personalized ads as a whole, which it definitely isn't.
