The general thing about state actors is that they have every incentive to have a dossier of compromising information on every foreign national regardless of current relevance, for potential use in the future. You could, for instance, someday be in a position where you have privileged access to data that becomes relevant to them, and thus your history becomes useful.
True, but the US has a long track record of pursuing both foreigners and citizens—through prosecutions, extraditions, sanctions, or asset seizures—often years later and regardless of nationality. In practical terms, the risk of being targeted by the US for breaking a law is far higher than being blackmailed by a foreign state like China. The consequences are asymmetric as well: blackmail usually amounts to little more than embarrassment, whereas being pursued by the US government can carry lengthy prison sentences or worse.
This is not to mention that the US also engages in data collection for coercion purposes.
State actors also have finite budgets and do cost/benefit analyses. They don't really gain much for creating and maintaining deep dossiers on hundreds of millions of random foreigners.
