I am all in for that and believe that Apple and others should ban these trackers or at least display a warning on what sdks are being used directly in the app store. that would be a good starting point.
These kinds of "transparency" rules is something I imagine a legislator would come up with after fierce lobbying by the ad-tech industry. Fortunately Apple is not a government and they can and should ban these SDKs. Developers will always complain and these days they'll claim it's anti-competitive, but that shouldn't stop them.