The idea of billions of devices out there with constantly running background ad-tech frameworks horrifying to me. It would make the AirTags stalking seem like a joke if every phone secretly tracked every Bluetooth. Right now Apple is in the stream to say no to that.
The argument seems to be Apple should just lock down things even further to prevent it from happening…
If you don't want to be tracked, don't use Google, Facebook, and other ad techs. Doesn't matter whether you installed their apps or not. Even today Apple can't meaningfully shield you from their tracking if you choose to use their free ad-supported services. (And if you don't, there's not much value in tracking you since they can't sell your attention to the highest bidder)
I'm not defending ad tech, but it will take complex legislation to reign it in. You can't just hide from it in Apple's walled garden, it does not work.
They wouldn't be subject to legislators' interest in the first place if they charged reasonable fees.