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Yes. Mobile and desktop apps have much more data leakage because they can store more data for longer and have much more APIs to use. A mobile app provides 100x more detailed data with more persistence than a website ever could.

This is well understood by the adtech industry and is why so many websites push apps in the first place.

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Historically I think you are right but I'm not so sure it's still the case.

Do you think an iPhone with the tracking blocker engaged is still a richer source of data than the web app on an iPhone? Facebook claims that Apple's privacy protections cost them $10 billion of revenue the first year.

Yes. Apple's changes have reduced tracking in both modalities but webapps are far more constricted by Safari than native apps.

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